Re-prioritize my todo list

Based on my current pain points.

I think the season of editor dinking may be almost done.
Move to subtree-merging yasnippet from GitHub

I'm not sure how stable yasnippet's master is. We'll see how this
works out.
Remove old yasnippet install

since a new one has been imported.
Pull in php yasnippets via subtree-merge
Activate yasnippet everywhere, and load php-mode snippets

Definitely going to want to narrow the focus eventually, but for the
moment this should work.