Torque 0.5.4

This is a bug fix release to rectify some issues with how URL's were rewritten when combining CSS files:

• Updated regexp in assets::buildCss() to fix issue where it matched a trailing quote, and streamlined how it handles inline data URI's
• Fixed bugs where realpath() cannot handle URL's with querystrings or hashbangs, it now just uses the path component
• Updated config::__construct() to handled the return value of overview::draw() as a string or null