Make bin/test download test dependancies.

Makefile

@@ -51,6 +51,4 @@ deps:
 		github.com/golang/lint/golint \
 		github.com/fzipp/gocyclo \
 		github.com/mattn/goveralls \
-		github.com/mjibson/esc \
-		github.com/davecgh/go-spew/spew \
-		github.com/pmezard/go-difflib/difflib
+		github.com/mjibson/esc

bin/test

@@ -3,6 +3,7 @@
 echo "mode: count" > profile.cov
 fail=0
 for dir in $(find . -type f -name '*_test.go' | grep -v '^./experimental/' | xargs -n1 dirname | sort -u); do
+  go get -t $dir
   output=$(mktemp cover.XXXXXXXXXX)
   if ! go test -tags netgo -covermode=count -coverprofile=$output $dir ; then
     fail=1