Prepare for 'unchecked' jobs reporting
 - FinishedChecking Enum
propagate_result on job -> set_result() on flow
Minor improvement to test error reporting
Merge branch 'master' of https://github.com/lechat/jenkinsflow

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
Don't use old style except
Test setup.py
Invoking -> Invoking Job/Flow
Improved jenkinsapi timing workaround