update composer.lock with symfony/property-access
fix phpspec with new datamap
[Transformer] Datamap use getTransformedData for target transformation

Datamap standalone was not very useful if we cannot specify which target we want.
This way provides a simple transformer without Doctrine requirement
[Datamap] Add spec

Add also a fix for phpspec... Not sure why
[Extractor] Add json extractor
[Extractor] Add spec

Fix the iteration and handle json_decode fails
Merge pull request #5 from tyx/feature/new-datamap

fix phpspec with new datamap
Merge pull request #4 from tyx/fix/update-composerlock

update composer.lock with symfony/property-access
add bin
Merge pull request #1 from tyx/feature/add-json-extractor

[Extractor] Add json extractor
Merge pull request #2 from tyx/feature/add-target-in-context

[Transformer] Add target in context
Create .travis.yml