updated database schema, changed Challenge model to have public field, not private
code review: update Challenge
code review: update companies controller
code review: update sessions controller
code review: update employees controller
code review: update Interview model, before_create callback instead of before_save and updated model tests
added form to go directly to an interview and added flash div to layout to hold error messages
added quiet_assests gem
update Challenge model test to test for mass assignment to public, not private
Merge pull request #19 from andmcgregor/code_review_revisions

revisions based on code review