new option --scl which will allows you to build srpm for software collection
move scl rpmbuild options to function and allow to build rpm using SC
use SCL for KojiReleaser
remove empty lines from rpm output

because output of:
rpm -q --qf '%{name}'  --eval '%undefine scl' --specfile rubygem-robotex.spec
is:

rubygem-robotex
(i.e. two empty lines, then the output)
add SCL support to RsyncReleaser
document RSYNC_USERNAME
document scl option for rsync releaser
Merge pull request #68 from xsuchy/pull-req-scl1

new option --scl which will allows you to build srpm for software collection