emu: Optimize directory hashing algorithm
emu: Add verify() method to Snapshot class
emu: Add a Source class
emu: Add action methods to Source class
emu/init: Remove --clean functionality

It's easier just to rm -rf .emu
emu/libemu: Support HEAD~ syntax
emu/log: Python rewrite and 0.1.x overhaul
emu/status: Python rewrite and 0.1.x overhaul
emu/log: Support -n limit of results
emu/log: Support -s short log
emu/log: Require a stack ID
test: Remove verify test
emu: Fix usage strings
emu: Use man pages for --help
emu/libemu: Add config parser wrapper
emu/status: Support selecting individual stacks
man: Update emu, init, log, status and verify
emu/libemu: Add (Stack|Source)LockError classes
templates: Exclude only .emu dir in root dir