Version 0.4
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* Use new R 3.2 download methods ("wininet" and "libcurl") when available.

Version 0.3
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* `source_url()` function now checks the SHA-1 hash the downloaded file.

* Add `sha_url()` function, for finding the SHA-1 hash of a remote file.

Version 0.2.2
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* Disable all network tests when running on CRAN, because the connection to the
 remote test website may not be reliable.

Version 0.2.1
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* Change https redirection test to not run on CRAN because their Windows build
  machine has more stringent security settings.

Version 0.2
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* Switched to using `Sys.which` to find external programs.

* Added tests.

* When using curl, follow redirects with http. (It already worked with https.)

* Add `source_url` function.
