Test Coverage about syndication HOT 4 OPEN

@philipjohn I went ahead and implemented the interceptor for the XMLRPC push syndications. You can see how it was implemented here:

https://github.com/xwp/syndication/blob/a69191b841e887f416bcbf4e4825fccea1eb7cde/tests/clients/test-xml-push-client.php

It's somewhat hackish, but it works and implements a real XMLRPC service, so that tests are pretty solid. It also uses a multisite instance to send the requests from one blog to another and tests the results on the other side.

Let me know your thoughts. PR #136 is ready for final review. It doesn't include REST tests because I will write those as part of issue #116

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Basic functionality:

• Add/edit/delete Sitegroups
• Add/edit/delete sites of each type
• RSS (pull) operations
• XML (pull) operations
• XML-RPC (push) operations (would probably have to use Multisite for tests)
• WordPress.com REST (push) (it's possible to run tests on wpcom but this may need to be snowflaked)

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Some progress in test-coverage

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@philipjohn I've completed all the tests except for the PUSH operations.

You've mentioned that for the XML RPC push tests, we should probably use Multisite, however when running tests, a web server is not involved and so it wouldn't be possible to send requests from one site to another.

The only option here is mocking. However the code isn't written using dependency injection so it's quite difficult. What I am currently thinking is that we try intercept the HTTP calls and return the response we expect to get from the XMLRPC service. The same would go for the REST service.

What do you think of the above? Any other suggestions?

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