Rename fuse.dom.Element#insertBefore, insertAfter, prepend, and append

I think that prototypes Element#insert should also be available + prototype don't expose Element._insertionTranslations for adding extensions to insert. It will be nice if FuseJS have such functionality.

p.s. If something like _insertionTranslations is exposed methods like insert({into:element}) insert({instead:element}) could be added

FuseJS's API goes from convenient/overloaded to very specific.
I plan on keeping fuse.dom.Element#insert as the convenient but not necessarily speedy option.

Resolved by http://github.com/jdalton/fusejs/commit/074a212e4f15e4322cef8b0e879d3b36012604fb