added support for MongoDB 2.6 wire protocol
added build_write_concern method to Mango::Collection
added support for bulk operations
pass around less data
better documentation for bson_raw
no need to mention unsafe operations anymore
improved Mango::BSON performance
inlined int32 and int64 handling
use new createIndexes command
explain how bulk operations are grouped
store offset with group
moved build_write_concern method to Mango::Database