Redis EVAL and EVALSHA fixes and tests.

[unknownnf]

Fixed:

• EVAL and EVALSHA need numKeys as first argument after script / SHA otherwise ERR is thrown - http://redis.io/commands/EVAL
• When calling an aliased method with __call() only $args should be passed as arguments.

Added:

• Tests for eval(), evalSha() and script()
• Aliases for eval and evaluate to _eval, evalSha and evaluateSha to _evalSha
• Function doProcessVariantResponse() to process multibulk responses.

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[unknownnf]

Signed.

[JoelMarcey]

@unknownnf Thanks! I am going to put this PR up for review internally right now.

[unknownnf]

I'm done with this PR for the moment since it's getting pretty big, I'll do other tests/fixes after it gets merged and I have more time.

[JoelMarcey]

@unknownnf Oh wow, you have added more commits to this PR. I have already put this PR for review up until and including 0f6549f.

Maybe the other 6 commits you have added since then can go in a separate PR? I suppose I could bring them in and squash them, but, like you said, we are already pretty big as it is.

What do you think?

[unknownnf]

Allright, I've removed the extra commits and cleaned up the current PR, updated description. I'll prepare another PR for the other tests and fixes.