Merge pull request #717 from amrutac/themes-plus-css-refactor

web/static/img/bitbucket-icon.svg

web/static/img/coreos-icon.svg

web/static/img/email-icon.svg

web/static/img/github-icon.svg

web/static/img/google-icon.svg

web/static/main.css

web/templates/approval.html

web/templates/header.html

web/templates/login.html

web/templates/oob.html

web/templates/password.html

web/themes/coreos/style.css

web/themes/coreos/styles.css

web/themes/tectonic/logo.png

web/themes/tectonic/styles.css