Merge pull request #2 from pavanh91/master

Added Event Class
Merge pull request #3 from pavanh91/master

Added sample files and other base files
Piston De-Activate

added piston deactivate function
Piston Deactivator
Merge pull request #4 from chriscush765/master

Added <code>PistonDeactivatorEvent</code>
Updated Readme file once again

Changed the link to the javadoc because the domain of the other link expired.