Refactor Mouse Triggers

Refactored mouse triggers (MouseLeftUp, MouseLeftDown) so that they work
for every mouse button instead (MouseUp, MouseDown)
Adapted demos accordingly (+link fixes)
Refactor Mouse Triggers Part2

Updated Readme with new example code
Merge pull request #1 from branch mucaho:patch-1

http://jsonlint.com/ is a nice place to validate package.json files.
Merge pull request #2 from remote-tracking branch
'choose_remote_name/GeneralizeMouseInput'