Logging methods were renamed so they don't trigger go-vet warnings for
error() and Error() formatting.
Unit tests were updated to use new github.com/stretchr repo (was renamed
from stretchrcom)
Missing methods were added to Message mock object.
- All mailbox actions working: index, list, show, html, source and delete
- Cleaned up extra files from Revel
- Took a guess at install process for README.md
This closes#4