Make Achilles proxies not intercepting finalize method

It may stress the Finalizer threads, because the JVM will detect that the finalize exists in the proxies, even if this method doesn't do anything.
Clean white spaces
Adds maven version badge
Fixes #144 FromClusterings/ToClusterings methods of SliceQuery API should take into account the clustering order
Upgrade to Cassandra 2.0.11 and Java Driver 2.0.7
Update 3.0.7 documentation
Fixes #139 [Perf] Avoid useless array objects creation for loggers at DEBUG/TRACE level
Remove useless log
Enhance Java doc for Event
Upgrade README before release
Generate 3.0.8 documentation
[maven-release-plugin] prepare release achilles-3.0.8
[maven-release-plugin] prepare for next development iteration
Support for Asynchronous operations
[maven-release-plugin] prepare release achilles-3.0.9
[maven-release-plugin] prepare for next development iteration
Change README for 3.0.9 release