Adding tabindex='-1' to the hidden iframe in FormPanel.

This makes the widget more accessible as users will no
longer tab to this hidden element, which was confusing
previously.

Change-Id: I804f36e44da0190ed75420448f42c0f61514ea30
Merge remote-tracking branch 'upstream/master'
Set -sourceLevel when precompiling modules

Without -sourceLevel, the gwtar files would depend on the JDK used to
compile GWT. We want GWT to be compatible with Java 6 JVMs so the gwtar
files must be built with -sourceLevel 1.6 whichever the JDK used to
produce the GWT artifacts.

Change-Id: I69250d554f66615aa2d99f44c612d5eba0d5a8b8
Add -logLevel arg to CodeServer

Bug: issue 8489
Change-Id: Ib7c43a9b42fdbbc2185aadb89fd80551c11ae1f3
Merge remote-tracking branch 'upstream/master'