patch matrix interpolation browser bug [closes #350]
patch matrix interpolation browser bug [closes #350]

There’s a Chromium and Firefox bug when it comes to matrix
interpolation, which breaks CSS transitions:

https://bugs.chromium.org/p/chromium/issues/detail?id=729010

This commit is a simple workaround that emulates the correct
behavior, just by using a near-zero value when zero is passed.

julianlloyd/scrollReveal.js,jlmakes/scrollReveal.js