write out system dependencies as well
add test for system dependencies

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Jars.freeze_loading acts on runtime only and NOT global for all runtimes

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reduce config
remove the --ignore-dependencies option when installing ruby-maven

in the trigger comes to install ruby-maven we need all its dependencies
as well, so we delete the --ignore-dependencies option inherited by the
outer "gem install" command.

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added test for the case when ruby-maven needs to be installed on the fly

using jruby-complete to install gem with jar-dependencies might need to
install ruby-maven on the fly. in the is case the --ignore-dependencies
should not propagate from the outer gem install to the one which installs
ruby-maven (we need all its dependencies !)

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prepare release
cleanup build
version bump

[skip ci]
Merge branch 'master' of github.com:mkristian/jar-dependencies
release 0.1.6
version bump