Better to override toString, which is used by getShortDescription anyway.
Localization.
/pluginManager/advanced would sometimes claim “Update information obtained: 43 yr ago”.
Due to a confusion between 0 and -1. Easier and clearer to use 0 as the “uninitialized” value.
JUnit 4 assumptions are the right way to mark a test as having been skipped.
Merge branch 'master' of github.com:jenkinsci/jenkins
fixed the test regression caused by json-lib 2.4
Fixing a test regression.

See 010b47d7307a11f0750fc01a00d99b96bbab9234 in stapler/stapler for the
actual fix.

I first discovered this on my local desktop yesterday as I was verifying
the fix for json-lib 2.4. From what I can tell, this has been broken all
along and it was working only because Facets are discovered in the lucky
order; JellyFacet got a chance to get at it before GroovyFacet did.

When I rebuilt from clean the problem stopped appearing, so I assumed
that there are some factors that cause JellyFacet to get loaded before
GroovyFacet (maybe the order in which Maven iterates dependencies or
something like that.)

But I'm no longer so sure now that I know J-on-J saw this problem at
about the same time. That's just too many coincidences.

But let's see if this would make J-on-J happy.
Minor update of the German localization strings.
Merge branch 'master' of https://github.com/jenkinsci/jenkins
fixed all the regressions
[JENKINS-13758] Maven multi module build records all changed modules of
istself combined with all previously changed build (to the last
successful  build)
Added additional safeguards:

- When the running build was not only started because of an SCM change
  a full build is done
- When the previous build was not only started because of an SCM change
  AND was not successfull, ALL modules that have not been successfully
  built are rebuilt as well.

see JENKINS-13758
Resolved functional conflicts after rebasing.
NPE Prevention