Homepage: Added Version class
Homepage|Build Repository: Made use of Version for nicer version number output

The following new properties were added to the JSON object graphs:

- (integer) version_major = major version number
- (integer) version_minor = minor version number
- (integer) version_patch = patch version number
- (integer) version_revision = revision version number (build number)
Merge branch 'master' of github.com:skyjake/Doomsday-Engine