Class Loader: Locate and load class files from a list of paths

This class can be used to locate and load class files from directories defined in a list of paths.

It provide a way to write PHP scripts that use classes without knowing in advance where the class files are located.

It can take a list of directories where to search the class files. Then it can search for given files in those directories. Optionally, it may search within sub-directories of the specified directories.

The result locations of the searched files may be cached in files to avoid the overhead in subsequent class path searches.