improved content type error
removed TODO
another tweak
added test to ensure no end line feed also works
Fix CSV Unmarshal return type

Codecs Unmarshal should always return either interface{} or
[]interface{}
added support for more types
Merge branch 'master' into radiobox-master

Conflicts:
	services/web_codec_service.go

Needed to alter getCodecByMimeString to return a ContentTypeNotSupportedError.