Ammend vm-main fsm to include return to main/exit and repet options
Address review feedback on repeatMenu/previousMenu

https://github.com/asterisk/node-voicemail-main/pull/1
https://github.com/asterisk/node-voicemail-mailbox/pull/1
https://github.com/asterisk/node-voicemail-main-fsm/pull/2
Now handling new regex config syntax.

Dtmf configuration was changed in Voicemail Main. This handles the
new regex configuration syntax.
Merge pull request #1 from samuelg/dtmfconfig

Now handling new regex config syntax.
Fix linter error
Merge pull request #2 from jrrose/master

Ammend vm-main fsm to include return to main/exit and repeat options