Add existing vim-badwolf-git PKGBUILD
Update vim-badwolf-git files

Delete `vimdoc.install`. It unnecessarily updates helptags and performs magic,
undocumented actions.

Update the actual PKGBUILD:

* List self as a contributor
* Make `pkgver` auto-update via a `pkgver()` function.
* Do not manually clone git repo. Pacman 4.1 can download and unpack several
  VCSs, so use that capability. Delete the `build()` function.
* Add 'vim-badwolf' to `provides` and `conflicts` arrays.
Set vim-badwolf-git epoch to 1

`epoch=1` because `pkgver` formerly used dates. For example: `pkgver=20130203`