Fix #116: Assets only supports 100 named groups

The pattern matching of assets matched every file added with #asset
to an named group. This is very memory consumting and not neccessary
to simply match filenames without accessing defined matched pattern
groups.

Simply changing named groups to anonymous groups fixes this error.
Merge pull request #117 from fastner/master

Fix #116: Named group error with 100 assets defined
Replace StrictVersion with LooseVersion, which works for version checks as well. Fix #119
Version bump to 1.0.3