created measure_snapshot model, updated tests and fabricators

Add: measure_snapshot is embedded in projects doc
Add: tests for measure snapshot and projects
Fix: counter and max code can handle  measures without codes on startup
change: moved initialization of counter into own method for testing purposes
Added backbone view to edit project measures

Add: backbone route, models, collections, views for project measures
Add: set active button on main navbar using jquery
Add: text truncation on project measures list
Change: remove .row class from #epm-container, so each view can add if needed
measures and tags view rendered in router, performance improvements

change: measures view can be replaced by router
change: tags view is decoupled from measures view
change: jquery improvments when iterating over all measures
change: render then insert in dom pattern applied for more views
change: cleaned up view code for easier maintainance