[New] travis-ci: use unittest to check if all module were built successfully.
[New] travis-ci: use unittest to check if all module were built successfully.

andrewchenshx/vnpy,andrewchenshx/vnpy,vnpy/vnpy,bigdig/vnpy,bigdig/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,msincenselee/vnpy,msincenselee/vnpy,bigdig/vnpy,bigdig/vnpy,vnpy/vnpy,andrewchenshx/vnpy,msincenselee/vnpy