Create a .gitignore file for refstackclient
Create a .gitignore file for refstackclient

Ignore a few of the common types of files.

Change-Id: Ic67a6d3e86b4d950a37c1bdccbb8c9ce75e27c1c

stackforge/refstack-client,stackforge/refstack-client,openstack/refstack-client,openstack/refstack-client