Fix pip install for development requirements
Fix pip install for development requirements

sgallagher/reviewboard,brennie/reviewboard,chipx86/reviewboard,sgallagher/reviewboard,reviewboard/reviewboard,davidt/reviewboard,brennie/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,davidt/reviewboard,brennie/reviewboard,reviewboard/reviewboard,davidt/reviewboard,sgallagher/reviewboard,chipx86/reviewboard,brennie/reviewboard,reviewboard/reviewboard,sgallagher/reviewboard,chipx86/reviewboard,davidt/reviewboard