Initial commit
1. Core requests updated (generics removed);
2. Drupal items management core updated.
1. Differences calculation methods implemented.
1. Drupal array implemented, minor API updates.
Commit validation
1. Comparator removed fields management updated.
1. Minor method description updates.
1. Drupal request interfaces updated.
1. Request response class handling fixed
1. Drupal entity structure updated.
1. commit validation
1. Stub tab host added to sample activity
1. Internal entity fields excluding is fixed.
Request canceling implemented.
1. Drupal value wrapper implemented.
1. Sample application updated.
1. Active requests counter implemented.
2. Sample app updated.
1. Listener method callbacks updated in Entity;
2. minor client constructor updates.
1. Gson constructor updated.
1. Sample app updated