Timestamped migration filenames

At this time option having a timestamped migrations is saved to .components file. Which is not the best choice, but the best we could come up with. 

So I opening this pull request to continue discussion on these topics:
1. Where to persist "timestamped" option for migrations filenames instead of .components
2. Which flag specify on project creation to enable it
3. Do we need rake/thor task that would convert existing numbered migrations to timestamped using date when files were committed to git