Reuters: Shares in oil major BP Plc rose on Monday after the company said it was capturing most of the oil gushing from its leaking Gulf of Mexico well, and that an additional capture system would be ready in mid-June. BP said on Sunday its lower marine riser package (LMRP) containment cap had captured 10,500 barrels on June 5 — compared with an estimated daily flow of 12,000 to 19,000 barrels. BP shares opened up 3 percent before falling back to trade up 2.24 percent at 1029 GMT …