Hbase client

The most contentious part of this is the non-strict inequality on line 68. `simhash-db-py` uses non-strict inequalities for redis and HBase, but strict ones for Riak and MongoDB.
You can drop the inner square brackets and turn this into a generator comprehension instead of a list comprehension.
```Python
families = dict((column_name(i), dict(time_to_live=ttl)) for i in range(self.num_tables))
```
Also, since Python 2.7, you can even use a [dictionary comprehension](http://legacy.python.org/dev/peps/pep-0274/):
```Python
families = {column_name(i): dict(time_to_live=ttl) for i in range(self.num_tables)}
```