archetype "ide" command, which generates ide helper files

[shaneafsar]

to: @eoneill

I've got an approach right now that works with the default archetype theme: https://github.com/ima007/archetype/commit/699eddfc48884af9a3bd5e136c28696a63a6aa2b

I'd love to get feedback on the approach/command line api while I take a look at making it work with any theme. I'm definitely not too fond of generating the SCSS files, and parsing them for the component & icon lists, but I wasn't quite sure how to do it in pure Ruby.