Revert "Re-added Gemfile.lock"

This reverts commit d7272afb94b81503ad6bf6a0baa4d3fd6339dea9.
Revert "Revert "Re-added Gemfile.lock""

This reverts commit 932b728417abbcb475c386caece07e604164fc9f.
Updated Gemfile with missing gems.

Still getting errors pushing to Heroku.