DownloadNotifier: Standardize play store and browser downloads

Image: http://i.imgur.com/w3VaRUK.png

PS1: Initial commit
PS2: Standardize all things!

Change-Id: I5e6c5def7dae10d714fd180693e95bc61205a57b
add .gitreview

Change-Id: Ieda83a9eaa6ace7a4a4bf30829f5b4cdfb9124be
Signed-off-by: Tianrui Guo <tianrui@pac-rom.com>