Changes to Notifier component

Adds the ability to change the background color, text color, and the display
length for the Notifier

Change-Id: I4102c5dfb759b5849994ca178d7f3cfa3445e955
Added a sensitivity property to the accelerometer (weak/moderate/strong)

Change-Id: I57e4dc46537dcfff298a6d7d2839e1e438179ed1