Initial crack at neocomplete

First crack at neocomplete.

As a result of `brew install macvim --custom-icons --override-system-vim --with-lua --with-luajit` there will be conflicts for users:

```
Would remove:
/usr/local/bin/vimdiff -> /usr/local/Cellar/vim/HEAD/bin/vimdiff
/usr/local/bin/vim -> /usr/local/Cellar/vim/HEAD/bin/vim
/usr/local/bin/view -> /usr/local/Cellar/vim/HEAD/bin/view
```

Basically just copied over the config from @Shougo's example. Open to changes there.

https://github.com/Shougo/neocomplete.vim/blob/master/doc/neocomplete.txt#L847-L848

I think this "heavy" configuration might be the root cause of all the slowness: `force_omni_input_patterns`.