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
this assumes you have maven installed on your local machine. What about using the gradlewrapper of the project and the maven plugin, if only someone had written how to do a release like this SKAAADOOOSH http://blog.blundell-apps.com/locally-release-an-android-library-for-jcenter-or-maven-central-inclusion/