Two vim configuration changes

First I've disabled creation of swapfiles to see if I really need them.
I probably won't until I do and then I'll regrert removing it.

Secondly I've also changed neocomplete to use CursorHoldI to show it's
completion menu because I noticed a delay when pressing and holding a
character in vim. Using CursorHoldI seems like something that would make
vim/neocomplete work less when I'm writing. It will also be less
annoying when writing comments and similar. Not sure if it will be too
slow when writing code now though...
Merge branch 'master' of https://github.com/marlun/dotfiles