vim: Add abbreviations for git tags and my email addresses
bashrc: Don't set PS1 colors

I frequently change between terminals with light and dark backgrounds,
sometimes open on the same workspace. Managing a colorful PS1 demands
too much overhead due to the war between light and dark.
profile: In PATH, prefer ccache wrapper dir over ~/bin

That is, order "~/.config/ccache/bin" before "~/bin".
git-home: Update script
vim: Import bundles as submodules