added OS X finder function

plugins/osx/osx.plugin.zsh

@@ -8,4 +8,18 @@ function tab() {
       do script with command "cd \"$PWD\"; $*" in window 1
     end tell
 EOF
+}
+
+# Functions for opening/finding/selecting things in OS X Finder
+
+function finder() {
+    if [[ $# -eq 0 ]]; then
+        open $PWD
+    elif [[ $# -eq 1 ]]; then
+        open $1
+    else
+        for dir in $argv; do
+            open $dir
+        done
+    fi
 }