Rebasehelper

Added
- Two new command line options used by upstream monitoring

Fixed
- **fedpkg** reimplementation

Changed
- Several improvements

Fixed
- **pkgdiff** is now smarter
- Included `tar.bz2` into list of supported formats
- Added support for noarch package in case of **fedpkg** build
- Checker should return `None` if there is no debug package

Removed
- Removed a bunch of debug stuff

Fixed
- Logs are being saved to their own directory
- Prep script is moved into workspace directory
- No more traceback in case `koji` module is not present
- Each checker creates its own log file
- **rebase-helper** informs if it failed or not
- Report on script is smarter

Added
- `upstream-monitoring.py` - used by upstream monitoring service
- `rebase-helper-fedmsg.py` - testing Python script

Added
- Parts of `%prep` section related to patching are executed
- Support for **abipkgdiff**

Fixed
- Several fixes
- Replaced `yum` with `dnf`

Added
- Added support for building packages via **fedpkg** (or **koji**)
- Added summary report for better overview
- `continue` option implemented for `git rebase`
- Added several tests
- Added class for operating with Git repositories

Changed
- `git rebase` is used instead of `patch` command

Fixed
- Fixed several decoding issues
- Several **PEP8** and **W1202** fixes

Removed
- `DiffHelper` class is not needed