Enable VS scoping by user, Measure JS clearing, and BB/SXML updates

### Story ###
- https://www.pivotaltracker.com/story/show/75918616
- https://www.pivotaltracker.com/story/show/76131322

### Notes ###
- updated <code>pregenerated_js</code>, added <code>clear_js</code> and <code>reset_js</code> for clearing measure JS, with optional <code>EMAIL</code> for scoping by desired user account
- included updates to latest Bonnie Bundler and SimpleXML Parser