Delegated exception creation to factories
Implemented the invalid parameter error converter
Implemented the invalid resource reference error converter
Removed php 5.4 notation
Implemented the user card error converter
Implemented the API error converter
Implemented the internal server error converter
Extracted http client configuration to smaller methods
Ignored composer.lock
Fixed example descriptions
Deactivated code coverage
Merge pull request #5 from gquemener/error-subscriber-refactoring

Error subscriber refactoring