Adds tabs for notifications view

Adds tabbing for Notices & Contact on notification view.
Fixes #88 - updates mis-named function

Function was named ‘close’ in the controller, when it should be
‘closeNofication`. This commit updates the function name.
Style updates for agency contacts

Updates styles for agency contacts to simplify positioning styles and
adds gradient to tab selector.
Adds unread messages counter

Adds counter for number of unread messages so that “no notifications”
popup shows when notifications are dismissed.
Simplifies content styles

Content style height was determined through a rather complex set of
variables. Since #content is fixed, this commit removes the height and
sets the ‘bottom’ attribute to the height of the footer.
Formats timestamp

Notification timestamp was not being formatted in template properly.
This converts the timestamp to milliseconds and then formats it to a
human readable value in the view.
Styling of contact page

Adds “Address” field to contact. Adds styling to address box.
Hides loading screen temporarily

Hides loading screen till the screen is functional.
Merge pull request #89 from codeforamerica/82-notifications-view

82 notifications view