Automatically load frameworks

[blitzrk]

It wouldn't be too hard or slow to search for other directories with sass files at the start of compile (e.g. node_modules/{compass,bourbon}) and automatically add them to the load-path.

If there is a .libsass.json and it's in a parent of the sass folders, then look down from there. If it's a guessed root, maybe it should start the search an extra directory up, but if this causes it to leave the user's project, that might concern them that their other files are being looked at.

[blitzrk]

Pushed a release that logs possible framework directories as it goes.