Killer README.

This tool is derived from OJI API tests Killer.

Usually used to help Mozilla to die in abnormal situations.

Two types of dialog windows processed:

1. Assertion dialogs(with 3 buttons: "Abort","Retry","Ignore"):
  - A "Ignore" button automatically pressed to continue working
2. Error dialogs(with 2 buttons: "OK","Cancel")
  - A "OK" button automatically pressed to forse Mozilla's termination