Jetpack portfolio fixes.

Make Jetpack portfolio styles work on any page (as long as they are in a wrapper).
Remove skrollr

Skrollr is cool, but it's a bit more code than I needed for one simple enhancement.
Reworks buttons.

This seems like a small code change, but it's really just moving some code around. Essentially, button classes we being added where they were not needed.
Change link hover state.
Changes animation.

Linear looks better than ease (I think).
Revert "Change link hover state."

This reverts commit b8346967231483733a93d8e80b7058a54d6258cf.
Change link hover state (again).

Simplification... or maybe not. :D