add support for local aliases
add sample config for local aliases
don't try to send local entries but comment them
fix coding style issues
Merge branch 'master' into local_aliases

Conflicts:
	taxi/commands.py
don't crash if there's no local_aliases setting
use new options getter
fix entries duration bug when committing
Don't add empty alias if local_aliases setting is not set or empty
Improve the way entries can be filtered
Exclude local entries from non workday entries even if they'll never get committed
Add tests for the local aliases feature
Handle local aliases in alias command output
Merge remote-tracking branch 'origin/local_aliases' (fixes #24)

Conflicts:
	doc/tksrc.sample
	taxi/commands.py
	taxi/models.py
	tests/commands/test_commit.py
	tests/commands/test_status.py