Adds mailcatcher support.

[EHLOVader]

This PR replaces #464

This is based off of the develop branch and should be used instead.

Includes:
RVM install
mailcatcher install
startup script
PHP smtp configuration
dashboard link to port

Later revisions also did the following:
Fixes issues with signature checks in the RVM installation process.
Removed the stopgap fix for i18n dependency issues of past.
Added blank lines per request.

[dwainm]

@EHLOVader this branch works. Thanks for all the effort, kudos to you. I hope it gets into master soon.

[jdevalk]

Works like a charm. Great work @EHLOVader, please merge @jeremyfelt :)

[hlashbrooke]

+1 to this - would love to see this in master soon :)

[cfoellmann]

@EHLOVader please edit your main comment and add Close #337 so it will close #337 automatically on merge

[cfoellmann]

👍 for merge

[tacoverdo]

👍

[jeremyfelt]

Thanks for all the great work @EHLOVader! And thanks to everyone for testing this out here and in #464. :)

Things seem to be working great after provisioning. I started with a fresh VM on develop and then did vagrant provision with this pull request applied. It added about 5 minutes because of the extra Ruby download, but that's not too bad. It would be nice to find a way to speed it up in the future if possible.

After merge I'm going to play with a few things:

• Attempt to silence the gem install that (I think) is generating the ruby download messaging. Because of how Vagrant displays the messaging, this creates a wall of red. Though silencing will create a wall of silence. We'll see. :)
• Look into what binding to 0.0.0.0 implies. It would be nice if we could bind to a specific address to avoid possible security issues, especially if someone has converted their box to a public IP for use with external testing.
• We're doing version detecting in a few places now for a couple things. We should be able to abstract this as a separate function to clean up provision.sh a bit.