Revert "revert Logo to test if bug caused by SVG"

This reverts commit 238df23a61cbddfca3cfdd461445eef12e632e9e.
Update CHANGELOG.md
Update CHANGELOG.md
Github login/signup button in login and signup pages :octocat:
Added github button to invitation and invitation html structure refactor :octocat:
github configuration page
Updating github integration doc
slug status column added
Fixing gulpfile
Task #1424: Login with GitHub
github form integration
add resolveUrlForAttributeModel method
fix manual loader call
removed unused dependencies in the github page
The GitHub button will not be rendered if is not configured
Update CHANGELOG.md
Fix error: undefined is not a function (evaluating \'$scope.us.revert()\')
Fix error: Extrange behavior of tg-us-estimation in lightboxes
Fold/unfold kanban columns
Save fold unfold status on storage