BUGFIX: fixed Xcode 5 warning
REFACTORING + SUBMODULE UPDATE: Facebook iOS sdk updated to 3.8 + removed Facebook's subproject: now the framework is included directly.

Advantages of direct include:
- less problems with configuration
- improved build time
SUBMODULE UPDATE: Dropbox - removed as submodule, added as framework
SUBMODULE UPDATE: google api objectivec
BUGFIX: SHKFormFieldLargeText

- on iOS7 there is no clip
- when imageTextLenght was set without image there was send button unlocking on wrong letter count.
Merged with upstream