added additional versions of python to the travis configuration;
added additional versions of python to the travis configuration;

imsardine/jenkinsapi,aerickson/jenkinsapi,mistermocha/jenkinsapi,aerickson/jenkinsapi,domenkozar/jenkinsapi,domenkozar/jenkinsapi,salimfadhley/jenkinsapi,JohnLZeller/jenkinsapi,JohnLZeller/jenkinsapi,jduan/jenkinsapi,jduan/jenkinsapi,zaro0508/jenkinsapi,zaro0508/jenkinsapi,imsardine/jenkinsapi,zaro0508/jenkinsapi,mistermocha/jenkinsapi,imsardine/jenkinsapi,salimfadhley/jenkinsapi,mistermocha/jenkinsapi,JohnLZeller/jenkinsapi