Run command on save

[DrJosh9000]

It'd be awesome to auto gofmt or goimports over the code just before saving, or on a key combo.
I guess this would manifest as a customisable pre- or post-save command option.

[aerth]

#66

[DrJosh9000]

Cool, didn't see #66. I think running a command post-save seems common and general enough to be a config option, but #66 would make me happy.

[aerth]

@DrJosh9000, #71 got merged and now you can use set goimports on at the ctrl+e prompt to use goimports.

[zyedidia]

You can now write a plugin for this. See the go plugin for an example.