#235 Cli generate

This is essentially just a wrapper around git clone right now. It checks that git is installed and then clones the skeleton repo at the path specified as an argument. Feedback is appreciated.

Some thoughts:
  - Should probably start managing releases on the Skeleton App repo and target those.
  - I think using the https version of git clone should be practical enough?
  - Perhaps we can upgrade this to be a yeomen generator in which case I'm not sure it fits in the CLI

Anyway right now it's totally functional.