Removed Otto library from git submodule dependencies, replaced with library JAR

Removed Otto library from git submodule dependencies
Added Otto library jar for version 1.3.4

Through http://square.github.io/otto/ , Otto is offered as JAR, similar to Picasso library.
OnionKit library is not like this, we both do required modifications to our own OnionKit fork until our pull requests get accepted and OnionKit is not used in JAR form.