Implement support for "eat" shell

[sergiodj]

Eat is the new kid on the block when it comes to shell support in Emacs. I'd like to suggest adding support for it in the C-c p x prefix map. I'll see if I can work on it this weekend. Thanks in advance for this great project!

[sergiodj]

There is eat-project, which DTRT when you configure project.el to use projectile's project root function. This is a good workaround for now.

[mattiasb]

I did this fwiw (and then I just added that command to projectile-command-map at x e).

EDIT: (You can ignore (mb-f-req 'eat) or change it to (require 'eat) btw).