Reset version number

There has been no CPAN release yet, and I plan to update $VERSION only
when CPAN releases occur.
Add in basic test

Added a test which loads an image from the filesystem and then creates
a mosaic from the image
Add support for different mosaic sampling modes

Add support for various sampling modes via ImageMagick

Reset the version number. Since there hasn't been a release yet it's
left as 0.01 so that perl doesn't complain during testing

Update docs