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Support multiple calls to Response::send

Alex Fraser requested to merge z0u:feature-copybuf into master

Currently, successive calls to Response::send may queue data to be sent twice. For example, the following will send "foo.foo.foo.bar.bar.baz.", when it should only send "foo.bar.baz.":

*response << "foo.";
response->send();
*response << "bar.";
response->send();
*response << "baz.";
response->send();

This pull request fixes the issue by taking a snapshot of the buffer before sending it. It also contains a unit test that fails with the old code but passes with the new. No other unit tests are broken by this code.

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