Update configs to allow for return to main/exit and repeat menu
Review feedback for repeatMenu and previousMenu

Pull Request: https://github.com/asterisk/node-voicemail-main-fsm/pull/2
Pull Request: https://github.com/asterisk/node-voicemail-main/pull/1
Pull Request: https://github.com/asterisk/node-voicemail-mailbox/pull/1
Changed config format for matching dtmf with regex.

Changed the configuration format for matching dtmfs to an action using
a regular expression so it can be mixed with simple dtmf/action mappings.
Merge pull request #2 from samuelg/dtmfconfig

Update to match new regex format for dtmfs.
Merge pull request #1 from jrrose/master

Update configs to allow for return to main/exit and repeat menu