Add autoenv plugin, which adopts using Kenneth Reitz's autoenv into

oh-my-zsh.

plugins/autoenv/autoenv.plugin.zsh

@@ -0,0 +1,18 @@
+# The use_env call below is a reusable command to activate/create a new Python
+# virtualenv, requiring only a single declarative line of code in your .env files.
+# It only performs an action if the requested virtualenv is not the current one.
+use_env() {
+    typeset venv
+    venv="$1"
+    if [[ "${VIRTUAL_ENV:t}" != "$venv" ]]; then
+        if workon | grep -q "$venv"; then
+            workon "$venv"
+        else
+            echo -n "Create virtualenv $venv now? (Yn) "
+            read answer
+            if [[ "$answer" == "Y" ]]; then
+                mkvirtualenv "$venv"
+            fi
+        fi
+    fi
+}