Add docs for fast compilation and Clojure CLI

• Document fast compilation and caveats.
• Document the use of Clojure CLI in addition to lein.

Update dependencies

Fixes the get this repo to work with the latest versions of the dependencies.

Add support for multiple file extensions

Bumped version to 0.1.1

Also bumped up dependency versions.
In particular, cryogen-core to 0.3.2 and cryogen-markdown to 0.1.13