Merge pull request #1 from gauthierm/master

Readme and doc fixes.
Use /usr/env to find PHP rather than relying on PEAR. This lets us run concentrate directly from a git checkout which makes development easier.
Allow inlining of LESS files the same as CSS files. Fixes multiple imports from at-imported LESS files (like mixins.less).
Combine files before compiling. This is still valid for LESS files. Allow compiling of combined files.