Added module to load virtualenvwrapper

modules/virtualenvwrapper/README.md

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+virtualenvwrapper
+=================
+
+Enables [virtualenvwrapper][venvwrapper] if installed.
+
+[virtualenvwrapper][venvwrapper] is a frontend to [virtualenv][venv] which
+provides convenient shell functions to create, switch and manage virtualenvs.
+
+This module will source the virtualenvwrapper initialization script, if
+[virtualenvwrapper][venvwrapper] is installed.
+
+[venvwrapper]: http://www.doughellmann.com/projects/virtualenvwrapper/
+[venv]: http://pypi.python.org/pypi/virtualenv

modules/virtualenvwrapper/init.zsh

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+#
+# Enables virtualenvwrapper if available.
+#
+# virtualenvwrapper is a utility to easily create, switch and manage Python
+# virtualenvs. See http://www.doughellmann.com/projects/virtualenvwrapper/
+#
+# Authors:
+#   Sebastian Wiesner <lunaryorn@googlemail.com>
+#
+
+if (( $+commands[virtualenvwrapper.sh] )); then
+    source virtualenvwrapper.sh
+fi