Collective.jsonmigrator

- Do not require simplejson if we already have the native json module. ale-rt

- Move pipeline configurations into own directory pipelines. thet

- Restructure blueprints to be in blueprints directory and integrate orphaned
blueprints from collective.blueprint.jsonmigrator. thet

- PEP 8. thet, mauritsvanrees

- Log json decode error instead of crashing marciomazza