Added yml example in ordered-associations.rst

And modified it to be in a configuration-block instead of separate code-block
Merge pull request #641 from bksunday/patch-1

Added yml example in ordered-associations.rst
Second cache level POC
First round of refactory
Fix factory method name
refactoring region access tests
basically support for many to many collection
Refactoring tests
store cascade collections
refactoring collections store
handle one to many collections storage