emulated clients

[dbu]

in the classes EmulatedHttpAsyncClient and EmulatedHttpClient we have a comment saying "This should be replaced by an anonymous class in PHP 7.". we now bump to php 7, so we could do this. however, i am not sure its worth it. right now, we have spec tests for those emulated clients. if we make them anonymous classes, we can't test them separately anymore, and the FlexibleHttpClient will become very complicated to test, i fear.

[dbu]

@sagikazarmark i think you originally wrote those - what is your opinion on this question?

[sagikazarmark]

I think it's okay to keep them. When I wrote those comments I don't think we had any real life usage for the emulated clients

[joelwurtz]

Agree with that also we should keep them and remove those comments about anonymous class

[dbu]

i am removing the comments in #123. and marking them as final without adding an interface, because the users should only typehint HttpClient / HttpAsyncClient and not care about them specifically being emulated clients.