Fix buildcache doc typos, use err param rather than ignoring it in UnreadableArtifact

Review Request #2801 - Created Sept. 11, 2015 and submitted

Information
Nick Howard (Twitter)
pants
2175
30ecf30...
Reviewers
pants-reviews
jsirois, stuhood

While looking at buildcache behavior, I noticed a few small things.

CI away on the attached PR

John Sirois
Nick Howard (Twitter)
Review request changed

Status: Closed (submitted)

Change Summary:

Merged at https://github.com/pantsbuild/pants/commit/1bef2af83aeb4c5ae6c2483b5f82f27d04fe8152

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