tweaks to developers guide

extend password reset expiration

extend the password reset token expiration from 1 hour to 48 hours.  this is mostly driven by the fact that new user invites include a password reset and expiring those after 1 hour seems ludicrous.

Error message for when reset token expires

Some cleanup to metadata guide doc

Revisions via new events system

update revision api tests so that they are focused on testing the endpoint functionality and not a bunch of other stuff.

flush out the unit tests for `(process-revision-event ...)` function which handles new events related to revision tracking.

rename to index to keep jekyll from barfing

Break up docs

fix placeholder on metadata field

handle subject to deal with sql backed cards