Quickstarts fixes

Removal of aerogear-parent; usage of Aerogear BOMs via dependencyManagement; refactoring of properties; Adding consume-aar ignore to eclipse plugin; Adding default Eclipse Android target; 

See also https://github.com/aerogear/aerogear-push-helloworld/pull/18, that was merged in aerogear-push-helloworld and applied the same changes
@vibe13  Do you have any suggestion for how to test that this doesn't break things beyond making sure `mvn clean install` doesn't break?