Haskell/Redmine Vim Tweaks, Aliases & Completions

* Add the haskell-vim plugin.
* Add RedmineWiki syntax highlighting to vim for the .redmine extension.

* Add hkredmine aliases to the zshrc.
* Add the awesomerc alias for editing AwesomeWM's rc.lua to zshrc.
* Add the _completions folder for custom command completions and a
  completion file for hkredmine.

* Modify vim to use neco-ghc's completion engine for Haskell files.
* Modify vimrc to display Haskell types in the autocompletion menu.