Update .bowerrc

Added fix for Heroku deployment ENOENT issues that occur since bower 1.2.8
Add linkedin support for login
upgrade to angular 1.2.10 to avoid interaction in bower installed based on https://github.com/linnovate/mean/pull/245 by #sogko
Merge pull request #243 from jonaswindey/patch-2

Update .bowerrc
Merge branch 'linkedin' of https://github.com/kalehv/mean into kalehv-linkedin
Added requirement to passport-linkedin to the package.json to fulfill missing requirement.