Bug 1178300 - Docs: Add Windows-specific setup help

Fixes #684.

docs/installation.rst

@@ -7,6 +7,7 @@ Prerequisites
 * If you are new to Mozilla or the A-Team, read the `A-Team Bootcamp`_.
 * Install Git_, Virtualbox_ and Vagrant_ 1.5+ (recent versions recommended).
 * Clone the `treeherder repo`_ from Github.
+* Windows only: Ensure MSYS ssh (ships with Git for Windows) is on the PATH, so Vagrant can find it (using PuTTY is more hassle).
 
 Setting up Vagrant
 ------------------

docs/troubleshooting.rst

@@ -33,6 +33,14 @@ Errors during Vagrant setup
 
   .. _guide: http://www.sysprobs.com/disable-enable-virtualization-technology-bios
 
+* On Windows, if upon running ``vagrant ssh`` you see the error *"/home/vagrant/.bash_aliases: line 1: syntax error near unexpected token `$'{\r''"* - it means your global Git line endings configuration is not correct. On the host machine run:
+
+  .. code-block:: bash
+
+    git config --global core.autocrlf input
+
+  You will then need to delete and reclone the repo (or else do a force checkout).
+
 Using supervisord for development
 ---------------------------------