Fix regression, bring back socket support, fixes #950

[FGRibreau]

Fix regression, bring back socket support, fixes #950

[FGRibreau]

Before this PR on master on my MBP (I don't know if master was stable or not):

1425 passing (2m)
8 pending
10 failing

after this PR:

1425 passing (2m)
8 pending
10 failing

no regression were introduced @BridgeAR. I will add some tests tomorrow morning :)

[FGRibreau]

@BridgeAR https://coveralls.io/builds/4677286/source?filename=index.js#L1302 is not tested, but I will wait for your feedback. Should I implement createClient(socket, options) (which was not implemented before) or only keep the constructor implementation?

[FGRibreau]

Hello @BridgeAR, any news on this? :) Do you want me to remove createClient(socket, options) implementation and only keep the constructor for backward compatibility?

[BridgeAR]

@FGRibreau I'm really busy right now and I guess I won't find time before next monday :/

If you attend the FOSDEM we could meet there though.

[FGRibreau]

Hello @BridgeAR,

This PR is too old so I will need to rebase, can you confirm you will be able to merge it then? I will only keep the constructor and remove the non-existing createClient(socket, options) :)

[FGRibreau]

function RedisClient (options, socket) {