Release 0.34: CLI improvements, tested on Python 3.6

Update stdeb.cfg from setup.py (to avoid duplicate dependencies)

Release 0.33: Support for pushing between repositories

Prepare new PyPI release after fixing issue xolox#2

Enable feature branch customization for merge_up()

Support for interactive merge conflict resolution

Command line interface for merge_up() functionality

Make it possible to merge changes up through release branches

Make it possible to add new files to repositories

Bug fix for previous commit (`hg remove --after' return code)