[Cask] Added feature mode (for gherkin), groovy, and Sanity Inc's Tomorrow themes
[themes] Switched to Monokai
[projects] Enhance jedcn-pp/rebuild-projects

It now deletes all projects and starts again.

I only minimally use project-persist, and so, I don't mind
destroying all of my projects when I rebuild them.

I implemented this because projects would "fall off" my selection list,
and I presume this had to do with how they were closed or emacs
shutdown.. and so the hope here is to forcefully rebuild stuff on
demand.
[projects] jedcn-pp/rebuild-projects now excludes non-directories
[projects] jedcn-pp/rebuild-projects slight refactor