Move "derived data" for Emacs pkgs into subdir.

(sorta stealing the idea from Emacs Prelude.)
Replace `jtilles` with `joshua.tilles`.

This is a remnant of the "VCA backend migration", in which the username
for my networked account changed from `jtilles` to `joshua.tilles`.

I looked into replacing the expression with something like
`$HOME/.gitignore_global` but it looks like Git doesn't support
that. (Cf. http://stackoverflow.com/q/11262010/600510 )

Since I can't use something like `$HOME` or `~` in my user-gitconfig,
this seems like a decent example of something that should be handled by
Pallet. (however, this opens a whole separate issue about deployment…)
Adapt to git-flow(-avh) 1.6
Remove IntelliJ config from this repo.

For two reasons:
1. I'm using `vcsh` now, which is more appropriate for JetBrains's
stuff.
2. I'm also using the "Ultimate" (read: commercial) edition now, so my
community-edition preferences are no longer relevant.
Bump dash.el’s version to 2.2.0
Bump ido-ubiquitous’s version to 2.9
Bump ibuffer-vc’s version to 0.7
Bump s.el’s version to 1.8.0

The internal key/value orderings got moved around because either
El-Get or "Easy Customization" (or both) determine some of the
semantics of `el-get-sources` from the K/V orderings. With
`:checkout` listed _second_, it just displays as a custom build-tag
instead of being listed next to "Checkout this `git' revision: ".
Bind ⌃W to `deleteWordBackward:` in Cocoa apps.

btw, the file was generated by CocoaBits's KeyBindingsEditor.app