renamed snazy.xsl to mospace.xsl as per DSpace theme conventions
Revert "renamed snazy.xsl to mospace.xsl as per DSpace theme conventions"

Because I've decided it's a bad idea to rename a theme that I intend to
contribute back to at some point. It's much better to just leave it
named as original author intended, so that commits to that them make
sense.

This reverts commit 846f32b6535810d9896e866c393a882b04f86f7c.
basing snazy.xsl on dri2xhtml-osu base theme