Migrate patternslib pattern to pat-tocify

Migrate existing pattern to `pat-tocify` package.
- [x] Use yeoman generator to create layout
- [x] Migrate tocify pattern
- [ ] Update collective.tocify to build resources from `pat-tocify`
## Further information

http://patternslib.com/pattern-styleguide/#main-content

The styleguide is incomplete and needs expanding. It's on my TODO list and I'll try to get to it ASAP.

One easy way to check for minimal compatibility is to copy the .jshint file from Patterns repo and put that in your own and then do a check.

Another easy way to get the pattern to adhere to conventions is to use the Yeoman generator to generate the package layout (you can then copy your pattern into the src dir).
https://www.npmjs.com/package/generator-patternslib

Start by reviewing the existing collective.tocify resource/build configuration and the migrated pattern in the src directory; the issue does not name exact files. Use pat-tocify and the generator-patternslib conventions as references, then verify that resources build from pat-tocify and run the .jshint compatibility check.

Written by the indexing model from the issue text.