Change Timezone

[krugerk]

As a user I should be able to change the timezone associated with my account from within the app.
The settings view shows the timezone associated with the beeminder account. The app currently does not support changing it.
One can change the timezone via the website.

Also, the app should inform me when the device's timezone is not the same as the timezone listed in the account.

[krugerk]

Detecting the difference, an alert like the following may be shown:

Title: Time Zone
Message: Your Beeminder account is currently set to a different time zone than your device. Beeminder will continue to use the time zone set in the account. You can change the time zone in the account settings on the website.
Button: OK

(And of course eventually referring to the place in the app where the setting can be changed.)