Added hook_field_data_string().
Added drupalgap_entity_assemble_data().
Changed the create and update node service resources to use drupalgap_entity_assemble_data().
Removed some old commented out code.
Fixed page titles by adding a unique h1 id for each page. Removed some debugging statements.
Fixed drupalgap_field_info_instances_add_to_form() so it will ignore empty delta items.
Removed old debugging statements.
Merged 7.x-1.x-alpha into 7.x-1.x-alpha-issue-160.