Bower.json changes

Hey guys, this is to solve the issue being discussed in #52 [to secure upload.php]

Hopefully this will make everyone a little more happy.

I added the examples directory to be ignored in bower.json - this was it is not installed under bower_components/ when a user adds angular-file-upload through bower install.
Documentation for Bower ignore  here: http://bower.io/#defining-a-package

I also updated AngularJS dependency to current version (1.2.11) instead of release candidate
Current version seen here: https://github.com/angular/angular.js/blob/master/CHANGELOG.md