Update README.rdoc

Point to my travis
Use jenkins branch for payload
make it readable!
Update rake file for rspec
Ignore .rspec
Move responsibility for target_url to jenkins
fix spec
Move responsibility for target_url to jenkins
Update help
Aim at a github SHA

still todo the ci
get correct jenkins build
Warn if no build found
remove debug
Merge remote-tracking branch 'origin/jhgl/run_by_sha'

Conflicts:
	lib/status/jenkins.rb
check if built on this SHA

faster and there may be no change set if rebased
Merge branch 'refs/heads/jhgl/run_by_sha'
Update README.rdoc
check pending
Merge branch 'refs/heads/jhgl/run_by_sha'
Change options to be clearer