Considered by many to be the biggest environmental disaster in  U.S. history, the oil spill in the Gulf of Mexico caused by the explosion of a British Petroleum rig in April of this year has caused at least 307 lawsuits to be brought against BP in the U.S.  According to the latest tally available through the Westlaw database, most of the lawsuits have been filed on behalf of businesses who have been harmed by the oil spill.  These include commercial fishermen, charter boat captains, shippers and resort operators, who claim …