New adapter with Horde

[eliasdarruda]

There are some differences between using :pg and Horde to handle in-memory distributed data
This just adds the possibility to use Nebulex taking advantage of Horde process distribution mechanism

All the adapter tests are passing, it would be nice if you could review it too :)

https://github.com/eliasdarruda/nebulex_adapters_horde

[coveralls]

Coverage remained the same at 100.0% when pulling 162dba2 on eliasdarruda:master into d7ad962 on cabol:master.

[cabol]

Awesome 🎉 !!!