Get reflection working for SA 1.4

[fgregg]

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Working on getting reflection for SA 1.4, will close #55

Also adds an mocked patch for execution_options

This would be cleaner and more specific if it was like

    class EngineMock(mocker.MagicMock):
        pass
    engine = EngineMock(spec=sa.engine.Engine)
    ...
    if version.parse(sa.__version__) >= version.parse('1.4'):
        sa.inspection._registrars[EngineMock] = sa.engine.Inspector._engine_insp

but, somehow subclassing MagicMock like this interferes with the tests from running.

[fgregg]

First need to figure out why tests are not passing. Probably should remove cybergrind's code and isolate what i'm working with.

It was trying to subclass mocker.MagicMock to EngineMock.