Re-added Parse.framework to fix "Parse/Parse.h" file not found error.

Not sure what was wrong, but this seemed to be a common error: https://www.google.com/search?q=xcode+%22parse%2Fparse.h%22+not+found&aq=f&oq=xcode+%22parse%2F&aqs=chrome.0.59j57j0l2j62l2.6435&sourceid=chrome&ie=UTF-8
Re-organized project structure.
Added LinkedInClient.
Persist login across sessions.
Set current user after login.
Moved login code into LIALinkedInHttpClient+Helpers category.
Persist LinkedIn access token.
Merge pull request #5 from ahuang13/jobseeker_login

Login for job seeker.