remove user_id from whitelist in learnings and comments
remove commented out method from login helper
user profile displays username and learnings
Refactored user show page to limit to recent learnings and display both username and github name.
Tested unhappy path (invalid user) for user profile.
User can edit their own username, and not anyone else's.
Merge pull request #4 from faizaanshamsi/user_profile

Add User Profiles