AngularJS Plug-in is not installed by default for AngularJS Project

Previously, with having Tern/AngularJS Natures, the Tern Project was setup accordingly (required definitions and plugins were set up on the project). Now, for the adopted projects there is no such a 'convertation', so, as the result, for an angular project we have no angular plug-in set up in .tern-project file.

Signed-off-by: vrubezhny <vrubezhny@exadel.com>