Add prelude-evil.
A reasonable default setup for using evil-mode with prelude.
Filter all hidden directories when adding to load-path

prelude-add-subfolders-to-load-path currently recurses into ".git"
directories for example.  Seems reasonable to skip any "hidden"
directory prefixed with a "."
Checks for ack-grep, for Debian systems.
Merge pull request #533 from tatsuhirosatou/ackInDebian

Checks for ack-grep, for Debian systems.
Merge pull request #526 from dougm/load-path-filter

Filter all hidden directories when adding to load-path
Merge pull request #523 from roryk/upstream

Add prelude-evil.
Mention freenode channel
Reorder a bit default module config
Auto-join #prelude-emacs and #projectile IRC channels
Merge remote-tracking branch 'bbatsov/master' into bbatsov-master