Merge lp://qastaging/~charlesk/indicator-datetime/lp-1370594-refresh-notifications-to-match-design into lp://qastaging/indicator-datetime/13.10

Make alarm notifications icons and button color match Design's specs.

== Description of the Change

 1. Use the new affirmative-tint hint to color the "OK" button.

 2. Work around unity-notifications bug #1370641 to remove the border around the notification's icon.

I.e., the green button coloring and icon now match design: https://i.imgur.com/Y8SHGnw.png

== Checklist

> Are there any related MPs required for this MP to build/function as expected? Please list.

No

> Is your branch in sync with latest trunk? (e.g. bzr pull lp:trunk -> no changes)

Yes

> Did the code build without warnings?

Yes

> Did the tests run successfully?

Yes

> Did you perform an exploratory manual test run of your code change and any related functionality?

Yes

> If you changed the packaging (debian), did you subscribe the ubuntu-unity team to this MP?

N/A

> What device (or emulator) has your component test plan been executed successfully on?

mako + RTM r46

> What manual tests are relevant for this MP?

Run any of the manual tests that involves creating an alarm; e.g. indicator-datetime/snooze, and confirm that the notification's icon and button color look like https://i.imgur.com/Y8SHGnw.png

> Did you include a link to the MR Review Checklist Template to make your reviewer's life easier?

https://wiki.ubuntu.com/Process/Merges/Checklists/indicator-datetime