send notifications : pull-request conflicts
- when a branch related pull-requests are changed
add warning color style for notification and state
Merge pull request #426 from kjkmadness/yobi refs/heads/enhancement/pullrequest
Fix utils.Url.create to work properly.

The method has ignored Host header from HTTP request.
Remove unnecssary code while getting hostport.
Warning if port is configured but hostname is not.