Finish v0.4.0
Remove some prints that slipped through
Add issue references to the changelog
Add "unix" format

Closes #2.
Update documentation for "unix" format addition
Update pytz to 2013b

Closes #4.
Update Settings abstraction
Default to `%c` instead of `%x %X` and refer to http://strfti.me/
Remove unused install.txt
Make pytz ST3-compatible
Make command files ST3-compatible
Rename generate_table.py so it isn't loaded by ST
Update readme, install.md, changelog and license
Fix ST3 bug with prompt=True
Finish st3-compatibility
Update changelog and messages.json for v0.5.0
Finish v0.5.0

Conflicts:
	messages/install.md