Version 0.7.5: Azure output formatting change

The user-visible change in this release is that chunks of text in the Microsoft Azure output (i.e., what is written to the .microsoft.txt files), are now separated using newlines, rather than spaces, to make the results more comparable to what Google produces.

Version 0.7.3

This version improves efficiency by iterating over files/URLs first and then over methods, so that files do not get repeatedly downloaded each time a different method is used. It also works around some network compatibility problems on differnet environments, and finally, adds a number of small fixes to messages printed. Previous recent versions improved the handling of rate limits by cloud services, and catched more error conditions gracefully.