Log Message:
Update ruby-haml from version 1.8.2 to version 2.2.10.

Pkgsrc changes:
- Update HOMEPAGE
- Build using gemspec

Upstream changes:
A lot! Please see http://haml-lang.com/docs/yardoc/HAML_CHANGELOG.md.html
for the list of changes since version 2.2.0. The changes from version
1.8.2 to version 2.0.10 are a little bit more difficult to get, it
seems you have to explore the commit logs of haml's git repository
or the haml mailing list.