Update Minify.php

Added two functions javascript_dir and stylesheet_dir, which would recursively walk through the directory passed and combine all files with .css and .js extensions respectively. No more individually specify the files.
Update Minify.php

Optimized...
Implemented fullUrl feature
Update Minify.php
added readme
Changed fullUrl to withFullUrl()
Merge branch 'pr/33' into develop

Conflicts:
	README.md
Merge pull request #34 from ceesvanegmond/develop

Develop