Rename evil-surround due to upstream changing.
Merge pull request #575 from lazywei/upstream-master

Rename evil-surround due to upstream changing.
Add key bindings for godoc

C-h G -> godoc: can be used in any mode

C-h f -> godoc-at-point: go-mode only
Merge pull request #578 from dougm/go

Add help-command mapping for godoc