Add ability to resume a JSON run
Add ability to resume a JSON run

* When a wiki has been checked, add it as the last resume point
* Save the resume point to a JSON file
* Add command line option to resume a run from that point
* For this to work, make sure we go through the wikis always in the same order

gpaumier/MrMetadata,gpaumier/MrMetadata,gpaumier/MrMetadata