Added main in package.json for jspm compatibility.
Added main in package.json for jspm compatibility.

peterbe/lovefield,google/lovefield,google/lovefield,ianscrivener/lovefield,ifraixedes/lovefield,digital-synapse/lovefield,peterbe/lovefield,ralic/lovefield,mcanthony/lovefield,sky7sea/lovefield,TimWillis/lovefield,robertbaker/lovefield,ianscrivener/lovefield,TimWillis/lovefield,ralic/lovefield,ianscrivener/lovefield,ifraixedes/lovefield,sky7sea/lovefield,jjow/lovefield,sky7sea/lovefield,peterbe/lovefield,jjow/lovefield,TimWillis/lovefield,ifraixedes/lovefield,mcanthony/lovefield,digital-synapse/lovefield,robertbaker/lovefield,ralic/lovefield,digital-synapse/lovefield,mcanthony/lovefield,google/lovefield,robertbaker/lovefield,jjow/lovefield