[hibernate-dev] OGM cassandra backend

[Jonathan Halliday]

The first part of the cassandra backend work is ready for review. I've 
backed out the incomplete association support, leaving the basic 
framework for the backend module with enough functionality to support 
entities that don't have relations. It's still larger than an average 
PR, but the module design follows an established pattern so it shouldn't 
cause too much problem.

Unfortunately the plugin that runs cassandra embedded is a bit stale and 
won't play nice with the newer cassandra release that is required for 
some bug fixes. Until it catches up, you (and the CI cluster) will need 
to bring up a db server manually before running the tests. Fortunately 
it's not hard:

http://www.apache.org/dyn/closer.cgi?path=/cassandra/2.1.4/apache-cassandra-2.1.4-bin.tar.gz

untar, then run  bin/cassandra -f

I has intended to roll straight into the association support 
functionality whist the PR on this first part was being reviewed, but I 
think I'll context switch to some infinispan stuff and return to OGM 
aligned with the next sprint starting in a couple of weeks.

Jonathan.

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