Fixes Rakefile, "Do not know how to build task 'default'" error. Changes production url for solr. Emergency fix to get solr working again.
Artifact wip
Artifacts data model WIP
resolve merge conflict
resolving merge issues
remove remaining visits and votes stuff, was breaking some things
WIP logic for joining users and artifacts
Better logic for join table between users and artifacts
removing tests related to user_items and dig_actions
admin mailer for request notifications
test to ensure admins are notified of new requests
mailer to notifty user of digitization approval
test for notifing user via email of request approval
test to ensure all users associated with an artifact are emailed on digitization approval
change language in state machine, eliminate approval state
mailer for artifact digitization denial, tests for artifact model
Creates audit log for artifact transitions

Audit log for artifacts tracks the transitions between states.
Added sponsorship and potential sponsorship logic for artifacts, based
on the transition logs.
Configures admin interface to show all the transition data for artifacts
and sponsorship data.

Upon further consideration though, we won't want to use the logs to key
off for the sponsorship data - because users will be able to withdraw
requests. Tomorrow I'll create a separate sponsors table instead, as
well as provide test coverage for these features.
Add confirmed flag to sponsorships
Add request withdrawal for artifacts

Cleaned up user/artifact relationship (all uses sponsorships now)
Added additional logging for last sponsor withdrawal
remove binding.pry