[x] Plugin and theme update notifications (on their respective admin pages). config.ini setting versionNotifications set to false should disable the notifications
[x] Tag browse for items should sort alphabetical by default on public view
[ ] New config.ini settings mail.force_from and mail.force_from_name: make all outgoing mail originate from the given address (and optionally the given "friendly" name)
[ ] New config.ini setting sslTrustProxy: if the ssl setting is enabled, whether to trust the contents of the "X-Forwarded-Proto" HTTP header (useful if you want to use the ssl setting but are hosting Omeka behind a proxy server)
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