Merge pull request #39 from ibuziuk/JBIDE-16468

JBIDE-16468 CordovaSim: Providing more intelligible message for Aerogear Push Plugin
JBIDE-17282 Unable to add plugin

Read textbox only if the project is not initialized already.
JBIDE-16468 CordovaSim: Adding checkbox "Do not show notifications" for AeroGear push plugin