Copied DownloadProgressTracker from bitcoinj#23

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MitchellCash wants to merge 3 commits intoPaycoinFoundation:masterfrom MitchellCash:DownloadProgressTracker

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Commits on Sep 30, 2015

Copied DownloadProgressTracker from bitcoinj

brenzosa
authored and
MitchellCash
committed
Fixed imported Utils package

brenzosa
authored and
MitchellCash
committed
Fixed imported Utils package and included methods from bitcoinj version

brenzosa
authored and
MitchellCash
committed