Changes to javadoc generation

Change "Google Web Toolkit" to "GWT", use "-source ${javac.source}"
instead of "-source 1.5" and add "-noindex -notree" to avoid generating
big files that nobody uses and wouldn't fit gwtproject.org constraints.

Change-Id: I85170407b11e27e8c8ff5fb2db77c46936205db5
1 file changed