* [panoramix] -> [dashed]
* merge from caravel/master
* Updated from airbnb
* Cleaning
* Rebase with upstream/master
* merge from caravel/master
* Updated from airbnb
* Cleaning
* Manual rebase
* Last pending change to rebase
* Convert date to datetime before serialization.
Approach choosen: transform data before serialize and keep just one way to serialize
* Unit test created
* stupid error :(
* remove uneeded code and rename test
* Avoid double type checking
Test updated
note: isinstance(<datetime>, <date>) == True, check order changed
* Increase coverage
* Fix assertRaises
