Thai Tran 504691a732 Subscriber form validation
Added a subscriber validator to prevent users from submitting invalid
subscribers. Valid formats are assumed to be http:// https:// and mailto:

Added a minimum value of 60 for ttl. When user adjusts value below 60,
an error message will appear.

Change-Id: I6143d00f128fa7c13b5d6687f48425be47f1208f
2016-06-27 20:43:23 +00:00
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