save pull request commit
add pullrequest event and timeline comment
add pull request commit events

add pull request commit notify
add pull request conflict resolved notify
fix notify link error
Refactoring pullRequest notification
Refactoring pull request merge

- remove pull request merge on pull request view
- legacy pull request initialization (commit/conflicts/patch/merging)
fix diffRevCommits bug
add changes state to merging at pull request accepta
commit save logic separation attempt merge internal
Merge pull request #118 from alecsiel/yobi refs/heads/pullrequest-refactoring