Generic driver

[konserw]

My proposition for issue:
Error when no testing framework is detected #80

[paoloambrosio]

Typo #inlude => #include

[paoloambrosio]

PR looks OK (see comments) but I have to say that I don't like much the macro CUKE_ENABLE_GENERICDRIVER. What do you think of triggering behaviour based on a different include? It shouldn't require many changes.

Current

With testing framework:

#include <CppSpec/CppSpec.h>
#include <cucumber-cpp/defs.hpp>

Without testing framework:

#include <cucumber-cpp/defs.hpp>

Proposed

With testing framework (it errors if it can't find it):

#include <CppSpec/CppSpec.h>
#include <cucumber-cpp/autodetect.hpp>

Without testing framework (using the generic driver):

#include <cucumber-cpp/generic.hpp>

Under the hood, autodetect.hpp would include DriverSelector.hpp and that should error if it can't find it, instead generic.hpp would include GenericDriver.hpp.

[paoloambrosio]

...or perhaps instead of introducing #include <cucumber-cpp/generic.hpp> we could keep using #include <cucumber-cpp/defs.hpp> if someone does not want the safety net of autodetect.hpp?

Revised proposal

With testing framework (it errors if it can't find it):

#include <CppSpec/CppSpec.h>
#include <cucumber-cpp/autodetect.hpp>

Without testing framework (using the generic driver as fallback if not found - backward compatible):

#include <cucumber-cpp/defs.hpp>

[paoloambrosio]

Added a test for the Generic Driver and removed duplication in paoloambrosio/cucumber-cpp@22c427a. Please include it in this PR.
Also had a change of heart and thought the autoswitching between generic and not was too dangerous, so I've marked it as deprecated in paoloambrosio/cucumber-cpp@cae0f25. For this I'll let you decide what you prefer.

[konserw]

I think that both your commits are good ;) I'm testing them right now and I'll push them in a second :)

[paoloambrosio]

In cases like 059878d + bd7871a, feel free to remove commits and use "push -f" to revert your own branch/PR so that the history reads better.

Is this ready to merge?

[konserw]

I've rebased it once again. I believe now it is ready ;)