Custom font families with apostrophes in the name are reported inactive incorrectly

[Joonas]

For instance loading custom font family Suisse Int'l would trigger the inactive callback, because all apostrophes are stripped from the font family name before using the native font watcher to check if it has been loaded triggering the timeout for the font load.

Fixing this would presumably require changes to https://github.com/typekit/webfontloader/blob/master/src/core/font.js#L59 to handle apostrophes inside the font family name correctly.