added omniauth gem
updated devise enviroment file
added omniauthible to Business model
added twitter sign up link to app nav bar
added omniauth controller for callbacks
added omniauth callbacks to routes
added all method to ominauth controller
added omniauth migration for businesses
removed validation of business address presence for omniauth
addded method to business controller for signup/in
added conditional to callbacks controller for unsuccessful sign in
added sessions to show error messages for unsuccessflu login
removed duplicate email presence true validation for businesses
removed validation, updated new_with_session and password_required business methods to accomodate onmiauth
hides password if not required via twitter
overrode update business account if account created through omniauth to prevent need for password
removed current pw from edit view with signed in with omniauth
Merge pull request #19 from kendallflutey/omniauth

Omniauth
styled nav bar for sign in/up
Merge pull request #20 from kendallflutey/update-login-bar

styled nav bar for sign in/up