Automate version bump in integration tests

Java webapp bump is done using the plugin as for the core.

Javascript version is no longer specified in package.json but
is implicitly the current one by the usage of npm link in
initialization.
Test for iterator on empty array
Summarizers dump full content instead of large IBF

IBF is a probabilistic data structure so to ensure termination of
the algorithm summarizer dump full content on the wire when the
requested IBF size would be larger than the number of items in the
whole repository.