Splitting HBase into modules for 0.94 and 0.96

This commit compiles and passes tests against HBase 0.94.16 + Hadoop
1.0.4 and against HBase 0.96.1.1-hadoop2 + Hadoop 2.2.0.

Several things still need work: titan-dist's dependency on titan-hbase
is no longer complete and effective since that's just a pom, some of
the hadoop dependencies need to be made optional and/or provided/test
scoped, probably some other stuff...
Adding HBase 0.96 adapter to titan-dist
Mark hadoop-core optional for HBase 0.94.x

Marking both the hbase and hadoop-core dependencies as optional to
make users redeclare the dependencies with their chosen
distribution/version.
Change localhost to 127.0.0.1 in cassandra.yaml

Makes Cassandra likelier to start on machines with a broken resolver
configuration.
Testing HBase 0.96 hadoop1/2 support

HBase 0.96 + hadoop1 is possibly broken pending
https://issues.apache.org/jira/browse/HBASE-10494

HBase 0.96 + hadoop2 compiles and tests against Hadoop 2.2.0.  This is
the default build configuration of the titan-hbase-096 module.
Disable HBase version defaults check in testing