global-theme-ignore

Heya Brian, I'm sending this over as a proposal to add the rules for ignoring generated theme files to the global gitignore. However, I don't know if there was any cases this doesn't address that led you to create a gitignore per theme file. If this *does* cover all of the cases, let me know, and we can create a ticket and remove all of the .gitignore files. If it doesn't, I would like to add the .gitignore to the theme_tmpl in tools, so that it's automatically done for developers. But hopefully this will cover our cases :) Thanks Brian,