Bump version to 2.2.0

Adjust version number and copyright for new release.

Bumping version for new bug-fix release.

Fix remaining Apache license reference. Fixes #155.

Merge pull request #135 from thomthom/master

Fixing load errors on systems where multi-byte characters are present in the load path.

Merge pull request #119 from thomthom/master

Final fixes and preparations for version 2.1 release.