HBase support

Added HBase support. Configuration is very basic so far.

Usage:
On HBase-Master:
```
class {'cdh4::hbase':
    master_domain => 'hbase-master.domain.com',
}
include cdh4::hbase::master
```
On HBase-Regionservers:
```
class {'cdh4::hbase':
    master_domain       => 'hbase-master.domain.com',
    zookeeper_master    => 'zookeeper-master.domain.com',
}
include cdh4::hbase::regionserver
```

You can also install/include both master and regionserver on the same host. HBase will then run in pseudo-distributed mode.