Starting to hack in some env var configuration goodness
Updating structs to use labels, adding tests for env stuff
Addressing `go vet` offenses
Merge remote-tracking branch 'origin/master' into env-config-fun

Conflicts:
	README.md
	app_test.go
	cli_test.go
Merge pull request #108 from modcloth/env-config-fun

Adding support for default from the env