[WIP] Roots v3

Opening this up just to keep track of the to-do list and such.

- [x] basic compile
- [x] live reload
- [x] compiler options
- [x] before/after hooks
- [x] multipass compiles
- [x] precompiled templates (extension)
- [x] dynamic content (extension)
- [x] environments
- [ ] debug mode
- [ ] custom compilers
- [ ] deployment (ship)
- [ ] package manager integration (bower etc)
- [ ] 100% test coverage
- [ ] complete documentation for all features and usage
- [ ] benchmarks and speed profiling