Update genjob.groovy: fix bug create job with name ""
Fixbug: genjob -n <jobname> -f "" => create job with default fetchaction
Fixbug: genjob -n <jobname> -f "" => create job with default fetchaction
Fixbug: relative directory and job contain ".job"
Merge pull request #5 from phamtienthanh-luvina/master

Fixbug: relative directory and job contain ".job"