Add stderr redirect to fix Windows Popen issue

This Python issue http://bugs.python.org/issue3905 details a problem with `Popen` when the host process has been launched from the cmd line.

A workaround is to redirect ALL of stdin, stdout and stderr to PIPE.
Merge pull request #850 from leafgarland/windows-popen

[vim] Add stderr redirect to fix Windows Popen issue
Emacs fsharp-mode support for multiple projects

* Should be seamless, project files autoloaded if found
* Output a message when a project is loaded
* Add a new integration test for this functionality

Fixes #235
Merge pull request #855 from rneatherway/issue235-multiple-projects

Emacs fsharp-mode support for multiple projects
Try again to make AppVeyor testing consistent

This change reverts previous failed attempts at fixes, and inserts a
sleep in JSON tests before requesting completion data. Hopefully these
8 seconds should be enough to get the helptext consistently.
Merge pull request #856 from rneatherway/integration-tests-fix

Integration tests fix