Moved repo root to ~/.vim/

Repo now lives entirely in ~/.vim/ directory, for ease of
cloning onto a new system.
Fixed color highlighting using autocmd hack

There must be a better "official" way to do this. Whatever.
Fixed up some mappings and options
Added tpope/pathogen submodule

Intelligent vim plugin management inside ~/.vim/bundle/

Yes, 3rd party vim plugins are a reasonable use case for git
submodules - not going to be doing lots of individual development
on them, just want to be able to pull changes when needed.
Added amdt/niji submodule for rainbow parens
Added reminder comment about pathogen and help