URL Tools Plugin

* Added urlencode -- alias to encode URLs from the command line using Python

* Added urldecode -- alias to decode URLs from the command line using Python

plugins/urltools/urltools.plugin.zsh

+# URL Tools
+# Adds handy command line aliases useful for dealing with URLs
+#
+# Taken from:
+# http://ruslanspivak.com/2010/06/02/urlencode-and-urldecode-from-a-command-line/
+
+alias urlencode='python -c "import sys, urllib as ul; print ul.quote_plus(sys.argv[1])"'
+
+alias urldecode='python -c "import sys, urllib as ul; print ul.unquote_plus(sys.argv[1])"'
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