document the new TEST_FILTER environment variable (#264)
document the new TEST_FILTER environment variable (#264)


drjanitor/tsickle,alexeagle/tsickle,angular/tsickle,alexeagle/tsickle,ncfxy/tsickle,angular/tsickle,drjanitor/tsickle,drjanitor/tsickle,lucidsoftware/tsickle,alexeagle/tsickle,lucidsoftware/tsickle,ncfxy/tsickle,ncfxy/tsickle,drjanitor/tsickle,lucidsoftware/tsickle