Release v0.7.0

* Updates EJS to 0.8.6
* Updates Node-sass to 0.8.3 with basic `@extends` support
* Updates Stylus to 0.42.3 with `blocks` support and more
* Updates LESS to 1.4.2 with Windows path fixes
* Fixes BOM encoding issue for Markdown files, thanks @ryanlewis
* Clarifies that Terraform is MIT licensed, thanks @108ium
* Tests every preprocessor for special characters

@sintaxi If you want to update lru-cache, here’s [the differences](https://github.com/isaacs/node-lru-cache/compare/v2.3.0...v2.5.0). All the tests pass but you might want to review the changes. Other than that, I think this release is ready.