ack-and-a-half: use ag command
Replace mu4e with gnus

Includes a quick implementation for the "trusted trio" email management,
plus a mu4e-like email sync (but faster as it runs external mail
programs concurrently).

Missing: mairix and bbdb integration.
Add bbdb for gnus
Updated gitignore
gnus: enable nnmairix for local imap layout
Merge branch 'gnus'
Use eldoc globally
Add align-cljlet