Revise Heroku // Add custom buildpack

[techtonik]

Looks like we need (#410) to build our own buildpack for Heroku, because it doesn't vendorize dependencies (heroku/heroku-buildpack-python#261).

• [ ] document deployment process
  • [ ] explain what is Heroku
  • [ ] explain what is buildpack
• [ ] fork Python buildpack
  • [ ] add command to use our vendorized dependencies

Document what buildpack are used to set repeatable and common environments, but they don't ues Makefile.

• [ ] add multiple buildpacks for SASS, npm etc.

[chadwhitacre]

@techtonik We vendor in dependencies over on gratipay.com. Why is that not an option here on IG?

[chadwhitacre]

In fact, I'm seeing vendor/ here as well. Are we simply not invoking pip install properly?

[techtonik]

Not we. Heroku.

[chadwhitacre]

@techtonik Okay, I believe vendored packages are working properly under Heroku over on gratipay.com. Compare here with there?

[techtonik]

@whit537 can you paste the build log? I don't have access to see it.

[techtonik]

I believe Gratipay doesn't work on Windows anymore, because it is unable to download binary wheels there after gratipay/gratipay.com#3292 was reverted.

[chadwhitacre]

Closing because this is overkill. Please provide more information.