Log Message:
Update to 2.57

Changelog:
2.57
	- t/x17_strage_overload.t didn't work correctly.

2.56  Sat Apr  6 09:58:32 2013
	- fixed t/x17_strage_overload.t (rt#84451 by Ricardo Signes)

2.55
	- update JSON::BackportPP version

2.54  Fri Apr  5 16:15:08 2013
	- fixed t/19_incr.t on perl >= 5.17.10 (wyant, rt#84154)
	    pathced by mbeijen and modified with demerphq's patch
	- Fixed some spelling (by briandfoy)
	- fixed sppeling (by Perlover)
	- enhanced documents (Thanks to Justin Hunter and Olof Johansson)
	- changed backend module loading for overloaded object behavior
	                                        (reported by tokuhirom)