Added pytest installation for 2.7 testing
Added pytest installation for 2.7 testing

OSSHealth/ghdata,kalepeterson/ghdata,kalepeterson/ghdata,kalepeterson/ghdata,OSSHealth/ghdata,Hackers-To-Engineers/ghdata-sprint1team-2,OSSHealth/ghdata,Hackers-To-Engineers/ghdata-sprint1team-2,Hackers-To-Engineers/ghdata-sprint1team-2