convert relative file paths in normalize_resource_url() to absolute paths
moved nose imports to the start of the file as they work
added normalize_resource_url() relative path test case
added relative path doctests; more bug fixes
fixed bugs in split_resource_url()
fixed bug in ZipFilePathPointer
fixed some doctests
fixed more doctests in split_resource_url()
Merge pull request #599 from jskda/pull_request.594

Pull request.594