Add support to create Jenkins object without immediately polling jobs.
minor fix to exception messages to improve readability.
Adapt fingerprint to catch HTTPError from requests

Remove reference to urllib2 exceptions as the HTTP fetches
uses 'requests' module
Fixed pylint violations
Simplified get_job_url function
Merge branch 'master' of github.com:salimfadhley/jenkinsapi
Small changes in jobs classes
Merge pull request #264 from lechat/job_improvements

Job improvements