Migration - Gradle & Android Studio

[rastadrian]

In an effort to keep this project updated for people that still uses this library, this PR migrates both projects to Android Studio & Gradle. NOTE: this project respects the original package, javadocs, license definitions and such.

For the library project:

• The project now compiles into an .aar file. This .aar file can be imported as a module in an Android Studio project.
• An android project by default adds some test classes that got added.

For the demo project

• It also is now an Android Studio project but the functionality remains pretty much the same.
• The original app icon was very low-res so I retained the default android ic_launcher icon.

To build any of the projects, just execute ./gradlew clean build in any of the project directories.

[SingingBush]

+1 for this and doing a release to maven central: #2

[rastadrian]

@SingingBush as soon as it get merged, I'll create a tag and a release, then we can upload this to jcenter()

[abiemann]

why isn't this merged yet ?

[jonneymendoza]

Can you merge this please?

[rastadrian]

Hey @jonneymendoza I've never had writing access to @maarek's repository. We need him to merge this.

[zorzv]

@maarek please merge this.