Added and Updated sw examples

Hello Neil,

Added and updated sw examples. For Xdesign mainly but it may also useful for the class too. Please merge to the branch for production.

The changes include - programs/machines:

1. Add Epilog/cut sw
2. Add Roland/mill/SRM-20/PCB sw
3. Add Roland/vinyl cutter/GX-24/cut sw
4. Updated ShopBot/mill 2D sw

modules/connect/svg:

1. Add SWExtractFaces,
2. Add SWPCB,
3. Add SWSelectFace

Not sure why git restored modules\toolpath\machines\laser cutter\Epilog to this branch. I don't think I have changed anything on it.

thanks, Shawn

modules/connect/svg/SWExtractFaces

+//
+// SWExtractFaces module extracts top faces of the same thickness from Tools/FabLab Connect command of SolidWorks products
+// 
+// Shawn Liu @ Dassault Systemes SolidWorks Corporation
+// (c) Massachusetts Institute of Technology 2016
+// 
+// This work may be reproduced, modified, distributed, performed, and 
+// displayed for any purpose, but must acknowledge the mods
+// project. Copyright is retained and must be preserved. The work is 
+// provided as is; no warranty is provided, and users accept all 
+// liability.
+//
+// closure
+//
+(function(){
+//
+// module globals
+//
+var mod = {}
+//
+// name
+//
+var name = 'SWExtractFaces'
+//
+// initialization
+//
+var init = function() {
+   mod.address = getParameterByName('swIP') || '127.0.0.1'
+   mod.port = getParameterByName('swPort') || '80'
+   mod.socket = 0
+   mod.thickness.value = 0.75
+   socket_open()
+   }
+//
+// inputs
+//
+var inputs = {}
+//
+// outputs
+//
+var outputs = {
+   SVGArray:{type:'object',
+      event:function(data){
+          mods.output(mod, 'SVGArray', JSON.parse(data))
+      }
+   }
+}
+//
+// interface
+//
+var interface = function(div){
+   mod.div = div
+   div.appendChild(document.createTextNode('server:'))
+   div.appendChild(document.createElement('br'))
+   div.appendChild(document.createTextNode('address: ' + getParameterByName('swIP')))
+   div.appendChild(document.createElement('br'))
+   div.appendChild(document.createTextNode('\u00a0\u00a0\u00a0\u00a0\u00a0port: ' + getParameterByName('swPort')))
+   div.appendChild(document.createElement('br'))
+   div.appendChild(document.createTextNode('\u00a0\u00a0status: '))
+   input = document.createElement('input')
+   input.type = 'text'
+   input.size = 12
+   div.appendChild(input)
+   mod.status = input
+   div.appendChild(document.createElement('br'))
+   var btn = document.createElement('button')
+   btn.style.margin = 1
+   btn.appendChild(document.createTextNode('open'))
+   btn.addEventListener('click', function () {
+       socket_open()
+   })
+   div.appendChild(btn)
+   var btn = document.createElement('button')
+   btn.style.margin = 1
+   btn.appendChild(document.createTextNode('close'))
+   btn.addEventListener('click', function () {
+       socket_close()
+   })
+   div.appendChild(btn)
+   div.appendChild(document.createElement('br'))
+   div.appendChild(document.createTextNode('thickness: '))
+   input = document.createElement('input')
+      input.type = 'text'
+      input.size = 10
+      div.appendChild(input)
+      mod.thickness = input
+   div.appendChild(document.createTextNode('(inch)'))
+   div.appendChild(document.createElement('br'))
+   var btn = document.createElement('button')
+      btn.style.margin = 1
+      btn.appendChild(document.createTextNode('Extract SVGs'))
+      btn.addEventListener('click',function() {
+         extract_SVGs()
+         })
+      div.appendChild(btn)
+   }
+//
+// local functions
+//
+
+function getParameterByName(name, url) {
+    if (!url) url = window.location.href;
+    name = name.replace(/[\[\]]/g, "\\$&");
+    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
+        results = regex.exec(url);
+    if (!results) return null;
+    if (!results[2]) return '';
+    return decodeURIComponent(results[2].replace(/\+/g, " "));
+}
+
+function socket_open() {
+   var url = "ws://"+mod.address+':'+mod.port
+   mod.socket = new WebSocket(url)
+   mod.socket.onopen = function(event) {
+       mod.status.value = "opened"
+       var connect = {}
+       connect.modCmd = 'connect'
+       connect.owner = getParameterByName('swOwner')
+       connect.id = getParameterByName('swID')
+       socket_send(JSON.stringify(connect))
+      }
+   mod.socket.onerror = function(event) {
+      mod.status.value = "can not open"
+      }
+   mod.socket.onmessage = function(event) {
+      mod.status.value = "receive"
+      var swData = JSON.parse(event.data);
+      if (swData.swType === "FaceSVGArray") {
+          outputs.SVGArray.event(JSON.stringify(swData.data))
+      }
+   }
+   mod.socket.onclose = function (event) {
+       mod.status.value = "connection closed"
+   }
+   }
+function socket_close() {
+   mod.socket.close()
+   mod.status.value = "closed"
+   mod.socket = 0
+   }
+function socket_send(msg) {
+   if (mod.socket != 0) {
+      mod.status.value = "send"
+      mod.socket.send(msg)
+      }
+   else {
+      mod.status.value = "can't send, not open"
+      }
+   }
+function extract_SVGs() {
+   var modcmd = new Object;
+   modcmd.modCmd = "AutoExtractFaces";
+   modcmd.thickness = Number(mod.thickness.value * 25.4); // inch to mm
+   socket_send(JSON.stringify(modcmd))
+   }
+
+//
+// return values
+//
+return ({
+   name:name,
+   init:init,
+   inputs:inputs,
+   outputs:outputs,
+   interface:interface
+   })
+}())