Add retry, delay and checksum support#1

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lancehudson wants to merge 8 commits intooriginalfrom

Commits on Dec 30, 2015

Add support for retries, retry delay and checksums
Lance Hudson
committed
remove a debug message and force remove file on checksum error
Lance Hudson
committed

Commits on Feb 9, 2017

Switch to use Octokit.release_for_tag since it doesn’t require paging.
lancehudson
committed

Commits on Feb 13, 2017

Ignore vendor files and update chef super market link
lancehudson
committed

Commits on Jul 27, 2017

Update metadata.rb
lancehudson
authored

Commits on Nov 28, 2018