fixed DateTime issue and created tests
deserialization of named DateTime array from XML currently fails!
refactored element type extraction line to separate function
refactored tests to exclude deserializing XmlKeyValuePairs
changed serialization visitors to use getElementType in AbstractVisitor
fixed DateTime issue and created tests
deserialization of named DateTime array from XML currently fails!
refactored element type extraction line to separate function
refactored tests to exclude deserializing XmlKeyValuePairs
changed serialization visitors to use getElementType in AbstractVisitor
fixed some styling issues, rebased, merged master
Merge remote-tracking branch 'origin/issue-199' into issue-199

Conflicts:
	src/JMS/Serializer/AbstractVisitor.php
	tests/JMS/Serializer/Tests/Serializer/BaseSerializationTest.php
	tests/JMS/Serializer/Tests/Serializer/JsonSerializationTest.php
finally merged upstream master
re-added DateTime tests
Merge pull request #201 from iwf-web/issue-199

fix issue #199: "array" type ignoring DateTime format