fixing get_last_build when the build is running and fixing is_running method as well
fixing get_last_build when the build is running and fixing is_running method as well

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