OP-4742 Add reseller purchase page and link from default.html.
4742 - reseller api - errors and results
4742 - reseller api - re-arrange some stuff per-review.
OP-4742 Incorporate some more reseller purchase changes.
OP-4742 Cleanup error section.
OP-4742 Change the reseller purchase example error responses.
Merge pull request #33 from demandchain/EL-OP-4742-return_values

El op 4742 return values