Add pyScss python package

[kevinmarsh]

Also updated/added a couple of its dependencies:

• updated enum34 to latest version and added a missing dependency for python 2.6 See comment below
• added pathlib

[kevinmarsh]

Hmm looks like the the build failed due to changing enum34 trigging beets to be built which ultimately fails due to a problem stemming from compiling kyotocabinet, I think I'l split the change to enum34 into a separate PR for further investigation.

[kevinmarsh]

Ok the second build passed so looks like updating enum34 was the culprit, I'll investigate further and PR that seperately

[lucabrunox]

Travis passed, thanks.