Fixed #135. Renamed the system 'header' block to 'title'.
Merge branch '7.x-1.x-alpha' into 7.x-1.x-issue-138
#138. Changed the page title callback system to asynchronous, now implementors must call the success callback sent to their title_callback implementation for hook menu items. Changed drupalgap_jqm_page_event_fire() to take into account the name of the callback so multiple functions can handle the same page event. Added drupalgap_jqm_page_event_script_code(), _drupalgap_page_title_pageshow(), _drupalgap_page_title_pageshow_success(). Changed menu_execute_active_handler() to use drupalgap_jqm_page_event_script_code() when setting up jQM page event handlers. Changed menu_execute_active_handler() to attach a pageshow handler to _drupalgap_page_title_pageshow() for setting the title. Changed node_page_title() to match the new asynchronous title system. Changed system_block_view() to return an empty h1 with id for the system 'title' block.