Update list of wireless carriers for mobile verification. 

Updated list based on: http://www.emailtextmessages.com
Photo change email notifications

Added email notifications whenever a personal or family photo is
changed.
Corrected spacing around operators.
Merge pull request #105 from churchio/photo-notification

Photo change email notifications
Added missing translations.
Merge pull request #106 from churchio/photo-notification

Added missing translations.
Don't show 'found existing account' notice if, you know, we didn't.
Sort mobile carrier list and remove duplicates.
Merge pull request #114 from churchio/update-carrier-list

Update list of wireless carriers for mobile verification.
Fix footer link [fixes #104]
Don't show the 'system' dummy page in admin.
Update content of help page.
I18n new checkin family controller.
Code style changes.
Ensure locale date format is honored when parsing dates.
Add new error when no parents are entered.
Fix error causing children to move up on validation errors [fixes #112]
Add a more prominent 'clear' button to checkin dashboard.
Merge pull request #113 from churchio/fix-signup-existing

Don't show 'found existing account' notice if, you know, we didn't.
Removed birthdate validation for adults

Issue #110