Adding a slow `nvm current` test, since it needs an installed version of node.

test/slow/Running "nvm current" should display current nvm environment.

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../nvm.sh
+
+nvm install 0.10
+
+[ "$(nvm current)" = "$(node -v)" ] || die "Failed to find current version: got \"$(nvm current)\", expected \"$(node -v)\""
+