feat(travis-ci): deploy to heroku from travis-ci

[caseyg1204]

Added commands to .travis.yml:

• set up local git environment
• install and setup heroku cli
• build app
• deploy app

[caseyg1204]

Not sure if you are interested in this or not. I had trouble finding information on how to deploy from travis or other ci tools.

These commands require a HEROKU_API_KEY environment variable on travis.

Thanks for putting together such an awesome tool.

[DaftMonk]

Very cool, and I can definitely see using this in my projects. Unfortunately I don't think this is something that the generator should scaffold, because it's too specific to one deployment strategy.

[kingcody]

Would the README.md be a suitable place for the addition?

[DaftMonk]

@kingcody Not directly, but we could add a docs folder and have the readme link to an .md file in there.

[kingcody]

@DaftMonk, I really like that idea. Could come in handy for a docs section on something like #460.

[caseyg1204]

I plan on documenting cd for azure and open shift in the next couple of weeks. Do you want me to pass those along?

[remicastaing]

I also worked something out for codeship + openshift. Any interest?