Including test for specific version listing

This fixes the issue of nvm ls v[:digit:].[:digit:].[:digit:] listing the version even if it isn't available

test/fast/Listing versions/Running "nvm ls" with node-like versioning vx.x.x should only list a matched version

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+mkdir ../../../v0.1.2
+
+. ../../../nvm.sh
+
+nvm ls v0.1 | grep v0.1.2 &&
+nvm ls v0.1.2 | grep v0.1.2 &&
+nvm ls v0.1. | grep N/A &&
+nvm ls v0.1.1 | grep N/A