Add a status option to CLI

[jcmuller]

I need a quick way to get the last build status of a job.

[cowboyd]

Playing devil's advocate here, but what about adding a --status option to the existing build_details command?

[drnic]

@jcmuller do you want to rebase this with/without @cowboyd fixes? I just happen to be coming through and looking at the jenkins.rb project for the first time in years. Using jenkins at my first workplace ever. Incredible but true :)

[jenkinsadmin]

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