Remove crypto dependencies

Not using these anywhere currently.

Paired with @christiansmith
Crypto is needed for base64 encoding

Used when sharing projects.

Paired with @toklok
Remove easter egg for toggle emacs keybindings

Dartium is no longer hears compose keys as key presses.

We have *a* solution emacs-keybindings-restored branch, but are unsure if
it is a good one.

Paired with @toklok

#81
Dot git ignore dot pub dir