Remove old vendor flags for CSS animations
Remove old vendor flags for CSS animations

Remove -o- and -moz- vendor flags for Opera and Mozilla.
Mozilla has long supported the standard CSS (since v 16)
and Opera has supported the webkit flag since version 15;
the -o- flag only takes you back to Opera 12, so no great
gains by including it.

Even the -webkit- flag is safely removable at this point.
Version compatibility (including with flags) specified
below:

Chrome: 43, -webkit- 4
Edge: 10
Firefox: 16, -moz- 5
Safari: 9, -webkit- 4
Opera: 30, -webkit- 15, -o- 12

stefco/stefco.github.io,stefco/stefco.github.io,stefco/stefco.github.io