Fix Version/s: unscheduled
a) Add option under "Account Settings->Display" for "Time zone "
Title: Time zone
Help text: Select the time zone used for timestamps in the user interface and email notifications.
[ Dropdown list of timezones by country region from http://www.freeformatter.com/time-zone-list-html-select.html]
b) Default time zone to browser time zone on account creation.
c) Change how timestamps are displayed across UI and email notifications based on time zone field.