Commits on Aug 18, 2020

1. Make bound on csprng more general. …

   `rand_core` defines a blanket impl of `RngCore + CryptoRng` for `&mut T` where
   `T: RngCore + CryptoRng`, so rather than requiring a borrowed RNG, it's better
   to require an owned RNG, as this allows passing either owned or borrowed
   values.  In particular, this makes `OsRng` usage much more ergonomic, because
   the caller is not forced to do `&mut OsRng` on the zero-sized struct.

   

   hdevalence committed Aug 18, 2020
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2. Update doc examples to remove deprecated code and restore testing. …

   Closes #59.
   
   The doc examples have code interspersed with text explaining the API.  Because
   each doctest executes independently, when these code examples are run as
   doctests, they have to include parts of the previous examples with # lines.
   These lines are hidden from Rustdoc output and do not appear in the rendered
   docs, but they do appear when viewing the README.md on Github.
   
   In order to hide these on Github, the code blocks were made non-executable,
   with their content moved to a unit test.  However, this meant that the example
   API usage was not tested, and so when the unit test was updated to remove the
   deprecated `rand_os`, there was no check that the examples stayed in sync with
   the test, causing #59.  To prevent this from reocurring in the future, go back
   to executable tests of the API examples.

   

   hdevalence committed Aug 18, 2020
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