Create snapshot returning 502

[aylusltd]

More details here. Not sure if examples is wrong or service down.

ArchiveLabs/api.archivelab.org#21

[benergize]

The service appears to be down again.

[mekarpeles]

I think at this stage, folks are trying to use the PRAGMA Labs service as a way to Save Page Now rather than as a w3c annotation service, so I am considering spinning it down.

Folks can easily use this block of code if they're trying to Save Page Now:
https://github.com/ArchiveLabs/pragma.archivelab.org/blob/master/pragma/api/pragmas.py#L51-L72