Add gitignore file

The tests folder contains hacky scripts that are used to test features that are being worked on such as programmatically creating orders so that we don't have to spend lots of time inefficiently clicking through the UI.
Let's leave test files in version control for now.
First stab at script to automate placing orders to help test extension
Merge pull request #9 from kojoman/dev

Add script to automate testing new orders..