Update README.md
Update README.md
Create .coveralls.yml
Update Gemfile
Call Coveralls
Fix https://github.com/jbox-web/redmine_git_hosting/issues/309
Test with latest Redmine versions
Fix https://github.com/jbox-web/redmine_git_hosting/issues/305
Fix https://github.com/jbox-web/redmine_git_hosting/issues/289
Merge branch 'devel' into v0.8-beta