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DownloadProvider: Add transfer speeds in notification
Screenshot: http://i.imgur.com/xqLRvMo.png

DownloadNotifier: Normal notification for singles
https://plus.google.com/u/0/+Mart%C3%ADndelRosarioOK/posts/hgGcgsFqyp6

DownloadNotifier: Standardize play store and browser downloads
Image: http://i.imgur.com/w3VaRUK.png

[2/2] DownloadProvider: DownloadManager: add support pause/resume/stop notifications
User can manually pause current download and resume to continue download remaining data of the file.
add a progressbar to show download progress. (only legacy View)
add pause/resume/stop/retry into notifications
add remaining time into notifications