Fix build tooling, update readme with build instructions.

 o Maven build file now works both for running tests and building .apk
 o Turned off code-obfuscation.. probably something to discuss, but I don't
   think we want to obfuscate the binaries.
 o Updated readme with build instructions.
Merge pull request #1 from trusthoarder/buildcleanup

Fix build tooling, update readme with build instructions.