Issue a deprecation when used in `before(:all)`.
Warn when test doubles are re-used in a second example.

Fixes #517.
Fix failing cuke.

For the generated description of `have_received` it needs
to memoize the expectation.
Fix indentation.
Merge pull request #522 from rspec/add-deprecations-for-519-to-2-99

Add deprecations for 519 to 2 99