JBIDE-15837 - Improve the CordovaJS library provider

Cordova library plug-in configuration is added

Signed-off-by: vrubezhny <vrubezhny@exadel.com>
JBIDE-17217 [javascript] Add an adapter for AngularJS-eclipse

The extension point definition is added

Signed-off-by: vrubezhny vrubezhny@exadel.com
JBIDE-17406 o.j.t.jst.jsdt has no source folder pointed in build.properties.

Source folder is added to build.properties

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