#138. Changed drupalgap_entity_render_content() to skip fields without displays. Changed taxonomy_menu() to use a container and pageshow injection on 'taxonomy/vocabulary/%/edit', 'taxonomy/term/%/edit' and changed taxonomy_term_page() and taxonomy_vocabulary_page() to use the container and pageshow injection technique. Removed a bunch of old debugging statements, replaced various spots with calls to drupalgap_error().