Disable issues sort. Recent issues on top. Fixed tests

app/assets/javascripts/issues.js

app/assets/stylesheets/gitlab_bootstrap.scss

app/mailers/notify.rb

app/models/project.rb

app/views/issues/_show.html.haml

app/views/issues/index.html.haml

app/views/issues/index.js.haml

config/initializers/1_settings.rb

lib/color.rb

spec/mailers/notify_spec.rb

spec/models/project_hooks_spec.rb

spec/models/project_spec.rb