Avoid fonttools spam

This release removes the INFO message about fonttools not being installed if subfont has a way to handle subsetting using google fonts. If subfont finds actual local fonts and fonttools is not installed, you'll see the INFO message with an addition of a list of the exact fonts that couldn't be optimized.

Pull requests

• #67 Only warn about missing fonttools install if we are actually trying t… (Peter Müller)

Commits to master

• Avoid failing in the code that counts the savings when fonttools isn't available (Andreas Lind)