Add release script

What the title says.

This is a bash script that will do everything for you:

 * Gets the version and the public maven repo path via param
 * Prompts user for confirmation
 * Builds the project
 * Executes the maven deploy task
 * Commits and pushes the changes to the public maven repo
but gradle generates an .aar file as output vs. maven generates a .jar, would that still be OK?