onqtam / doctest / 937

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travis-ci

finally resolved issue #126 and #143 "properly" - turns out the problem is this: when using clang from xcode - that means libc++. in that case I include <iosfwd> instead of forward-declaring std::ostream myself. Then if the user includes somewhere only the doctest header and <string> and then does a comparison - then and only then will there be some linker issue which I previously had managed to resolve by telling the users to also include <iostream> in that place in their tests. This is a toolchain issue when using the <iosfwd> header - the details are still not clear to me but I managed to get the linker to pull in what is necessary by adding a dummy unused global function in the implementation of doctest that uses operator<< of std::string to print to std::cout.

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