Allow use of multiple vim instances to be used at once

[mattjmorrison]

I'm not sure the best way to write a test to demonstrate this... I started one... then.... that was as far as I got....

It's pretty easy to replicate - say you've got a python script in one terminal and a query in another... you kick off the python script using this plugin, then while it's running kick off the query - which gets an error - then the python script ends and you end up with the Python scripts output and the query's errors in the output pane of the python script.... I believe this should fix that issue...