- add alert warning when user has old java version when starting desktop sharing.
Revert " - add alert warning when user has old java version when starting desktop sharing."

This reverts commit 570ea3c6f8e8c3953125fd467c5d19a44e764422.
 - add version check on applet. Don't allow sharing of screen when java version
   is lower than 1.7.0_45
Merge branch 'master' of github.com:bigbluebutton/bigbluebutton