updated default safe variable to false
updated default safe variable to false

According to the mongodb people:

========================================================================================
=  Please ensure that you set the default safe variable to one of the                  =
=   allowed values of [true | false | {j:true} | {w:n, wtimeout:n} | {fsync:true}]     =
=   the default value is false which means the driver receives does                    =
=   return the information of the success/error of the insert/update/remove            =
=                                                                                      =
=   ex: new Db(new Server('localhost', 27017), {safe:true})                            =
=                                                                                      =
=   http://www.mongodb.org/display/DOCS/getLastError+Command                           =
=                                                                                      =
=  The default of false will change to true in the near future                         =
=                                                                                      =
=  This message will disappear when the default safe is set on the driver Db           =
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