Nova Scotia’s N-D-P leader is pledging to revoke a controversial bill that imposed a contract on the province’s teachers. Gary Burrill says he’ll reopen negotiations with the union representing 93 hundred public school teachers if his New Democrats win the May 30th election. The province’s Liberal government imposed a four-year contract on teachers earlier this year after a protracted labour dispute. At a campaign rally in Halifax, Burrill also promised to introduce class-size caps for all grades