#178. Added theme_submit(). Added _drupalgap_form_state_values_assemble_get_element_value() using code extracted from drupalgap_form_state_values_assemble(). Changed drupalgap_form_state_values_assemble() to properly iterate over field delta values. Changed _drupalgap_form_render_element() to again run the element item(s) through the theme system after preprocessing the item based on its type. Changed drupalgap_entity_build_from_form_state() to properly iterate over field delta items. Temporarily commented out image_form_alter(). Changed drupalgap_node_assemble_data() to properly iterate over field item delta(s).