- Modify constructors for inbound and outbound group sessions
- Add new Ecxception class

- Fix warning compiler

- Simplify JNI function signatures definition (Account & Session)

- review comments header
- refactor utility functions

 - new file olm_utility.cpp to have a stand alone function to initialize/alloc a random buffer
 - new class OlmMessage
 - complete OlmSession API with encryptMessage()
 - comments review
 - OlmAccount unit tests are green
 - new gradle to compile the shared lib according to debug mode

- Add Android Studio project

- Add file

Split ratchet algorithm out to a separate section.

Also clean up some phrasing and correct a typo or two.

Fix jenkins.sh

Update comment on olm_account_one_time_keys

Document what it actually returns.

Remove the messsage index from olm_init_inbound_group_session

Add a olm_inbound_group_session_id method