BUG: Fixed bug with returning non-primitive dicts.

tests/resources/saved_state_archive/zipline.finance.blotter.Order/State_Version_1

@@ -48,7 +48,7 @@ p20
 I6
 sS'id'
 p21
-S'66ba5ccdddf84fb886427412c5803fd7'
+S'd34900be98354821b96936b1b6a5cac3'
 p22
 sS'filled'
 p23

tests/resources/saved_state_archive/zipline.finance.performance.period.PerformancePeriod/State_Version_1

@@ -171,38 +171,24 @@ F0.0
 sg55
 F0.0
 sg33
-g4
-(czipline.protocol
-Positions
-p70
-c__builtin__
-dict
-p71
-(dp72
-tp73
-Rp74
+(dp70
 sS'positions_value'
-p75
+p71
 F0.0
 sS'start_date'
-p76
+p72
 NsbsS'starting_value'
-p77
+p73
 F0.0
 sS'period_open'
-p78
+p74
 NsS'period_close'
-p79
+p75
 NsS'orders_by_id'
-p80
-ccyordereddict._cyordereddict
-OrderedDict
-p81
-((lp82
-tp83
-Rp84
+p76
+(dp77
 ssS'initargs'
-p85
+p78
 NsS'newargs'
-p86
+p79
 Ns.

tests/resources/saved_state_archive/zipline.protocol.Portfolio/State_Version_1

@@ -25,25 +25,14 @@ p9
 F0.0
 sS'positions'
 p10
-ccopy_reg
-_reconstructor
-p11
-(czipline.protocol
-Positions
-p12
-c__builtin__
-dict
-p13
-(dp14
-tp15
-Rp16
+(dp11
 sS'positions_value'
-p17
+p12
 F0.0
 sS'start_date'
-p18
+p13
 NssS'initargs'
-p19
+p14
 NsS'newargs'
-p20
+p15
 Ns.