Add rebase functionality

[dl1998]

Implement functionality that will allow to do set of actions that are supported by git rebase command.
Subset of actions that shall be supported includes, but not limited to:

• Remove commit
• Split commit into n commits
• Merge commits
• Rename commit
• Change order of the commits
• Modify content of the commit

Links:

• Git Rebase Description
• git-rebase command documentation