Make AngularJS-eclipse to be able to treat a custom project nature as Angular nature.

This will allow AngularJS-eclipse to be more or less seamlessly integrated to other products.

Signed-off-by: vrubezhny <vrubezhny@exadel.com>
Merge pull request #55 from vrubezhny/makeAngularJSAdaptableToOtherNatures

Make AngularJS-eclipse to be able to treat a custom project nature as An...