Initial commit  for this task. Not tested yet
Implement branch/tag source check and sets default branch of repository in case if source is loaded from tag
Implement resolving update date from real commit history
Add fallback for update date and write about this in docs
Fix get commits by obvious set name of branch. Code refactoring accorfing to @tadatuta notations for this pull request
Merge pull request #13 from bem/BEMINFO-116

Beminfo 116 Get update date from commit history