Convert To AngularJS Project action handler adds second Tern.java nature
in case it already exists on a project.

Issue is fixed

Signed-off-by: vrubezhny <vrubezhny@exadel.com>
Merge pull request #25 from vrubezhny/bugInConfigureProject

Convert To AngularJS Project action handler adds second Tern.java nature

Many Thank's Victor for your fix!