Add snapshot of "jruby-jars-*.gem" to the CI build

[donv]

The last snapshot build of the jruby-jars gem should be downloadable from http://ci.jruby.org/ for both stable branches.

Ruboto tests need them to test JRuby changes continually.

How are these artifacts created?

[donv]

jruby-jarsbuilds are now available from http://ci.jruby.org/ , but the jruby-1_7 build seems broken.

@mkristian has tried to fix it, but he does not have access to trigger a new build, so the development cycle is 24 hours (a bit slow) :)

Having fresh jruby-jars builds available helps catching JRuby bugs for embedded use like Ruboto earlier.

[donv]

This is the build that is failing: https://projectodd.ci.cloudbees.com/view/JRuby/job/jruby-1.7-dist/

[donv]

@headius @enebo Maybe I and/or @mkristian could get access to trigger JRuby ci builds? Access to the build configuration would also be good.

[headius]

The build has been fixed in 2e47b23 (which is pretty stupid...why are these versions not getting updated properly?).

[donv]

Thanks!

[mkristian]

@headius I improved your patch a bit since the update of those versions are a manual sed script or so. c7ce772 not sure why the removal of the -SNAPSHOT is not needed anymore ?