Update Start for Play 2.2

Location of the Unix script that starts a Play application has changed in  2.2. Prior, to 2.2 the Unix script was named start and it resided in the root level folder of the distribution. With 2.2 the start script is named as per the project’s name and it resides in the distribution’s bin folder.
Update README.md

Updating for Play 2.2
Update start

corrected path to app name
Change to handle versions Play 2 earlier than Play 2.2
Updated readme to make clear works with Play versions 2.0 through 2.2
Update README.md
Update start
Update start
Update start
Update README.md
Update start
Update start
Update start
Update README.md
Update README.md
Update README.md
Update README.md
Update stop: only kill the play process, not any other java processes.

I had the issue of git push failing due to an error in the stop script: it attempts to pkill java, however, play is not the only java process active, there is also activemq. The app has no permission to kill the activemq process so the stop script fails. These changes rectify this. 
Tested with a local Openshift Origin application.
Merge pull request #1 from jschaul/master

Update stop: only kill the play process, not any other java processes.
Update stop

back to killing all java processes to stop as play is not being detected from cut off ps aux text.