Add Travis CI integration

Also adds commented-out deployment on tag specification
(push build artifacts to Github releases page).

Notice that requries libraries are directly taken from
raylib/release/libs/android folder and nativeLoader.java is generated by
Makefile on the go

Using shared libraries just don't work...

It should be reviewed more carefully...

Requires some work, distortion shader could be move out of raylib to
example code...

Added: DrawRectangleGradientV()
Added: DrawRectangleGradientH()

OpenAL Soft and raylib compiled for release and stripped

...almost there! raylib already works, issues with OpenAL Soft
linkage...

- Renamed some folders
- Added some files for testing
- Removed useless files

For some reason it's not working properly... :(

Integrate master changes into develop...

Integrate Develop branch

Increment version in meson build file