Remove playdoh-lib and funfactory

This will enable us to more easily modify or remove depedencies and submodules.

Question: Do we want this?

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*Note: before merging this pull request (or pulling from upstream once this is merged), remove the contents of your `vendor` directory (including dotfiles). The merge/pull will go much more smoothly.*

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- [x] [Tests pass!](https://travis-ci.org/drkitty/cyder/builds/19428530)
- [x] Maintain migration works
- [x] Web interface works
- [x] API works