JBIDE-17673 Need to switch jst.jsdt to the latest tested Tern v.0.4.0.201407021311

The dependencies are updated
Extension points usage is updated

Signed-off-by: vrubezhny <vrubezhny@exadel.com>
JBIDE-17674 Remove 'wrong Node.js install' workaround

Workaround is removed

Signed-off-by: vrubezhny <vrubezhny@exadel.com>