Tal Levy 0bf4c8fb82 Add on_failure field to processors and pipelines.
both processors and pipelines now have the ability to define
a separate list of processors to be executed if the original line
of execution throws an Exception.

processors without an on_failure parameter defined will throw an
exception and exit the pipeline immediately. processors with on_failure
defined will catch the exception and allow for further processors to
run. Exceptions within the on_failure block will be treated the same as
the top-level.
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