[All] Add virtualenv hooks

virtualenvwrapper/postactivate

@@ -0,0 +1,6 @@
+#!/bin/zsh
+# This hook is sourced after every virtualenv is activated.
+
+if [[ -n "$TMUX" ]]; then
+    tmux set-environment VIRTUAL_ENV $VIRTUAL_ENV
+fi

virtualenvwrapper/postdeactivate

@@ -0,0 +1,6 @@
+#!/bin/zsh
+# This hook is sourced after every virtualenv is deactivated.
+
+if [[ -n "$TMUX" ]]; then
+    tmux set-environment -r VIRTUAL_ENV
+fi

virtualenvwrapper/postmkvirtualenv

@@ -0,0 +1,4 @@
+#!/bin/zsh
+# This hook is sourced after a new virtualenv is activated.
+
+pip3 install neovim