- trying to fix various storage related issues, and to have a "clean" api for various storage types
  * cleaned up dropbox & browser connectors
  * cleaned up storage related elements in various project classes
  * right now , its either or for dropbox & browser : the "special" methods for saving file's raw data to dropbox works for save & load, but is at l
least partially incompatible with the standard bkbone sync methods, localstorage works, but requires a different save procedure in the Project class
  * model destruction was not done correctly (files were removed from the collection not destroyed), that is now corrected in the file tree view
  * experimented with delayed destroy in the dropbox connector, so model deletion only happends on "save": works but is hack-ish
- renamed all connectors to "stores" (as connectors does not make much sens given that they STORE data)
- deleted old app main file (app_old.coffee)
- added modelbinding to stl & amf exporter views
 * now the export button is automagically disabled based on the projects compile status
 * a bit of template & code cleanup