- big cleanup of store's source:
 * removed all too specific methods (moved to old-** files in src folder for now)
 * moved and refactored a lot of methods from dropboxFS into main dropbox-store code
 * overall cleanup of login & login, read, write etc
 * all api methods now return deferreds (as they should)

- updated package.json & gruntfile with correct dependencies and build process
- added custom element (polymer) , generated lib from store's source
and client side dependency