#32, #64, #73. Attempts at improving the back button feature before I saw cschaub's latest improvements. This code should be merged back in eventually with the related improvements.
Merge branch '7.x-1.x-alpha-back-button' into 7.x-1.x-alpha
Wrapped user_register() in a try catch.
Added drupalgap_path_get(), drupalgap_path_set() and drupalgap_jqm_active_page_url(). Replaced usage of drupalgap.path with drupalgap_path_get and drupalgap_path_set().