Merge pull request #76 from kaybomv/api

Added readme and error validation
changed log-in page styling
Merge pull request #77 from lennylemony/groupFlow

changed log-in page styling
added footer on all pages, added lightbox on groups view page
Merge pull request #78 from lennylemony/groupFlow

added footer on all pages, added lightbox on groups view page
Added error validatino and pushing to heroku
Fixed CSS issues with footer and dropdown menu