Revert "code + specs to  store github profile url"

This reverts commit eda4a0bf5e6eaadd6b6ce3813f0bd4c0a84ae46c.
Revert "migration to add github_profile_url to User"

This reverts commit 715d64f5c814c13f8a07da6a71cb30d61223ce2e.
Revert "view + specs for github profile link at user profile"

This reverts commit bdbb95245286ac6484825fa5dedfbba22d06b9a3.
Revert "cukes for Github profile link on user profile"

This reverts commit 96f341a42cab9b385568ec3b2c07a5e6e24fd993.
Merge pull request #266 from AgileVentures/dev2

Reverting from #258 Yaro/Github link on user profile page