Added a rebuild script to set default flags
Added a rebuild script to set default flags

mongodb-labs/mongo-hhvm-driver-prototype,jmikola/mongo-hhvm-driver,jmikola/mongo-hhvm-driver,mongodb-labs/mongo-hhvm-driver-prototype,10gen-labs/mongo-hhvm-driver-prototype,jmikola/mongo-hhvm-driver,mongodb/mongo-hhvm-driver,jmikola/mongo-hhvm-driver-prototype,jmikola/mongo-hhvm-driver-prototype,mongodb/mongo-hhvm-driver,mongodb-labs/mongo-hhvm-driver,jmikola/mongo-hhvm-driver-prototype,mongodb-labs/mongo-hhvm-driver,mongodb-labs/mongo-hhvm-driver-prototype,10gen-labs/mongo-hhvm-driver-prototype,mongodb/mongo-hhvm-driver,mongodb-labs/mongo-hhvm-driver,mongodb-labs/mongo-hhvm-driver,10gen-labs/mongo-hhvm-driver-prototype,mongodb/mongo-hhvm-driver,10gen-labs/mongo-hhvm-driver-prototype,jmikola/mongo-hhvm-driver-prototype,jmikola/mongo-hhvm-driver,mongodb-labs/mongo-hhvm-driver-prototype