Added two new options and fixed implementation of skipremin option.
Skipremin option would actually not bundle in .min. scripts to the
outputbundleonly option skips creation of individual .min files for each
file in the bundle - it only outputs the "whole" bundle file.
bundleminonly option skips creation of the non-minimized bundle file,
and only writes the minimized version to disk.
Updated documentation to reflect these new options.