v0.8.1

A few convenience features and bug fixes.

Full Changelog

Closed issues:

• Also look in current directory for config file #60
• Should validate changeset 'source' is in config hierarchy #27

Merged pull requests:

• Fixes #27: Validate changeset; cache individual assignments #78 (alechenninger)
• Handle errors better when looking for config files #77 (alechenninger)
• Use same options to refer to source/target for both apply and set #76 (alechenninger)
• Fixes #60: Look for .monarch files in working directories and parents #75 (alechenninger)