Added support for Clementine

Clementine also stores some files in APP_SUPPORT/Clementine, but
AFAIK they're only caches and the music database, so not suitable
for backing up or syncing.
Merge branch 'clementine' of https://github.com/lachlancooper/mackup into lachlancooper-clementine

Conflicts:
	CHANGELOG.md
	README.md
	mackup.py