Apply styles to error messages on testConnection button

- add `ui-msg-*` class set of rules for messaging
- add support for messsage response type on connection test method
- fix positioning on message
Change classes to .ui-msg-inline

These are technically inline messages, we may have a global message system soon, so I'm calling this .inline for now.
Merge pull request #372 from strongloop/feature/ui-messaging

Apply styles to error messages on testConnection button fix #347