Merge tag 'v0.2.2' into develop

v0.2.2
Merge branch 'master' into develop
Updated gradle to use robolectric
Added Testcases for Log
Added tests for Util.java and optimized tests for Log.java
Added test class for ShellCommand.java
Added tests for ShellCommand.java
Added Testcases for CpuArchHelper.java
removed robolectric for now
Updated test cases for CpuArchHelper
Removed unused code + CommonTestCase.java is Abstract class now
Added travis.yml file
Merge branch 'feature/testcases' into develop
Updated gitignore
Updated travis config
Updated compile sdk version and travis
updated travis file
Updated Tests
Updated travis to create android emulator with sdcard
Updated travis.yml