3.0 Beta 10

Beta 10 is mostly a bug fix release with one new feature:

• [new] Added support (in iOS 10) for skipping cancelation if the estimated amount of time to complete the download is less than the average time to first byte for a host. #364 garrettmoon
• [fixed] Fixes an issue where PINResume would assert because the server didn't return an expected content length.
• [fixed] Fixed bytes per second on download tasks (which could affect if an image is progressively rendered) #360 garrettmoon
• [new] Added request configuration handler to allow customizing HTTP headers per request #355 zachwaugh
• [fixed] Moved storage of resume data to disk from memory. garrettmoon
• [fixed] Hopefully fixes crashes occuring in PINURLSessionManager on iOS 9. garrettmoon