Make sure the new `versions` directory is filtered out of nvm_ls output (in zsh).

nvm.sh

@@ -231,7 +231,7 @@ nvm_ls() {
     fi
     if [ -d "$(nvm_version_dir new)" ]; then
       VERSIONS=`find "$(nvm_version_dir new)/" "$(nvm_version_dir old)/" -maxdepth 1 -type d -name "$PATTERN*" -exec basename '{}' ';' \
-        | sort -t. -u -k 1.2,1n -k 2,2n -k 3,3n | \grep -v '^ *\.' | \grep -e '^v'`
+        | sort -t. -u -k 1.2,1n -k 2,2n -k 3,3n | \grep -v '^ *\.' | \grep -e '^v' | \grep -v -e '^versions$'`
     else
       VERSIONS=`find "$(nvm_version_dir old)/" -maxdepth 1 -type d -name "$PATTERN*" -exec basename '{}' ';' \
         | sort -t. -u -k 1.2,1n -k 2,2n -k 3,3n | \grep -v '^ *\.' | \grep -e '^v'`

test/fast/Listing versions/Running "nvm ls" should filter out "versions"

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+mkdir ../../../v0.1.3
+mkdir ../../../v0.2.3
+
+. ../../../nvm.sh
+
+mkdir ../../../versions
+
+[ -z "$(nvm ls | \grep 'versions')" ]
+# The result should contain only the appropriate version numbers.
+
+rmdir ../../../versions
+