Merge pull request #65 from Codingspezis/develop

From now on pull request etc. will be checked via travis.
Extracted fragment for wishes and refactored code.
Ran lint and solved some errors and warnings
Optimized imports
Refactoring, Patch version bump
Downversioned build SDK version
Update build.gradle

Replaced ' with " in buildToolsVersion
Removed duplicate annotation
assembling instead of androidTest in travis CI build
Using new android gradle plugin and buildtools. fixed an error that was discovered via travis.
Fixed #45

* extracted about fragment
* added open source note
* simplified about screen
* restructured license notes
Extracted some Exceptions and OpencorePlayerProfilingInfo.java
Using DummyPlayerCallback instead of null check
Merged break conditions
executed "reformat" and "optimize imports"
Extreacted some Exceptions and OpencorePlayerProfilingInfo.java
Some minor refactorings and documentations
Some build tool changes

* Using new android gradle plugin and buildtools
* Fixed an error that was discovered via travis.
* Corrected some more build script related changes
Remoed unused imports
Fixed travis build