WIP regroup entries
Merge branch 'master' into regroup_entries

Conflicts:
	taxi/commands.py
Add regroup tests
Add tests for the commit command
Add --force-yes option
Add initial value for start_date and end_date on projects if not set
Add tests for the clean-aliases command
Don't autofill entries file if file is speficied on the command line (fixes #6)
Merge branch 'master' into regroup_entries

Conflicts:
	taxi/commands.py
Fix import error
Fix description in grouped ignored entries (fixes #14)
Merge branch 'regroup_entries'