Replace Hydra with Slate

Closes #6.

- Add slate.js configuration file
  Based on my previous slate.js file [1] plus some customizations.
  Requires reslate.js [2].
- Add reslate.js [2] as submodule
- Add installation step in install.sh for the configuration
- Remove all Hydra stuff

[1] http://git.io/M3vnHA
[2] https://github.com/lunixbochs/reslate