* get the system jars into jbundle

* better checking when to "update" Jarfile.lock on the fly

* use updated dependencies

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adde some comment
added test for https://github.com/jruby/jruby/issues/2079

this finally fixes #52

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new build
added test to ensure no unwanted updates of Jarfile.lock

it also ensures that if .jbundler/classpath.rb is missing it will
be regenerated from the Jarfile.lock. fixes #48

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cleanup build and prepare release
update versions
cleanup IT setup