add Windows-specific info about virtualenvwrapper; ignore more files

.gitignore

@@ -1,2 +1,6 @@
 docs/_build
 .idea
+
+# Ignore irrelevant files from the Sublime Text editor
+*.sublime-workspace
+*.sublime-project

docs/dev/virtualenvs.rst

@@ -74,6 +74,17 @@ To install (make sure **virtualenv** is already installed):
 
 (`Full virtualenvwrapper install instructions <http://www.doughellmann.com/docs/virtualenvwrapper/#introduction>`_.)
 
+For Windows, you can use the `virtualenvwrapper-powershell <https://bitbucket.org/guillermooo/virtualenvwrapper-powershell>`_ clone.
+
+To install (make sure **virtualenv** is already installed):
+
+.. code-block:: console
+
+  PS> pip install virtualenvwrapper-powershell
+  PS> $env:WORKON_HOME="~/Envs"
+  PS> mkdir $env:WORKON_HOME
+  PS> import-module virtualenvwrapper
+
 Basic Usage
 ~~~~~~~~~~~