~/.env: set variables necessary for go builds.

used it for building docker. i like that go builds standalone binaries.
i'd like to have something like that for clojure.

.env

@@ -30,3 +30,6 @@ add_to_path() {
}
add_to_path .bin .cabal .gem/ruby/2.0.0/bin erlang-git
add_to_path  ~/.lang_*
export GOPATH=$HOME/.go
export PATH=$GOPATH/bin:$PATH