vim: Do not maximize window

It is useless because already enabled fullscreen feature
vim: Remove vimshell prompt color configuration

vimshell is not featured
vim: Add colorswatch.vim
vim: Visualize end of lines
vim: Disable dangerous default key mappings
vim: Add more typable key mappings
vim: Show buffers only in a current tab
fish: Set &shell to POSIX-compatible shell

See also: http://this.aereal.org/entry/2014/02/02/002254
fish: Add fishshell config
vim: Add fish-vim
vimperator: Back to Vimperator
slate: Remove trailing comma
slate: Remove .slate.coffee

Simplify and reduce maintained files