various tweaks

add space.vim back (accidentally deleted?)
remove dash.vim (Mac app for documentation lookup)

note: reconfigure sneak.vim

to add:
https://github.com/tacahiroy/ctrlp-funky
https://github.com/tpope/gem-ctags
https://github.com/tpope/vim-bundler
https://github.com/tpope/vim-rsi
https://github.com/tpope/vim-heroku
https://github.com/tpope/hookup
https://github.com/terryma/vim-multiple-cursors
https://github.com/Shougo/vimshell.vim