Upgrade JNR to allow usage in OSGI

Description

JNR is currently excluded in OSGI, because its artifacts don't have proper descriptors.

This is a reminder that we need to upgrade it once the following pull requests have made it into a stable release:

See also: https://github.com/datastax/java-driver/pull/591#issuecomment-192091559

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Olivier Michallat

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