fix sqlite3 blob store expiry

this bug caused authn to not restore keys on restart. it was not caught
by test coverage because tests can't control time.

Merge pull request keratin#23 from keratin/redis-optional

Redis is optional

1.0.0-rc3

Merge pull request keratin#18 from keratin/metrics

add: `GET /metrics` (authenticated)

verify Origin header instead of Referer

the Origin header is already a dependency for CORS and was intended for this purpose:
https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)_Prevention_Cheat_Sheet#Verifying_Same_Origin_with_Standard_Headers

fix tests for cda77c1

omit http auth from webhook error reports

Merge pull request keratin#4 from keratin/update_username

require currentPassword to change password w/o token

Merge pull request keratin#1 from keratin/sentry

Error Reporting: stdout & Sentry