Fix test broken in 70193bdb
allow zamboni's settings.BROWSERID_DOMAIN to override fireplace's settings.persona_unverified_issuer and settings.BROWSERID_JS_URL to override Persona's login.js location (bug 902229)
remove settings assignment in TestEmailApi
tweak add-ons search to search tags (bug 809590)
Merge pull request #934 from ngokevin/search

tweak add-ons search to search tags (bug 809590)
Bump app-validator

Like a million fixed bugs.
Removes explicit ID from migration 638.