DATAREDIS-333 - Use binary version of Jedis.evalsha()

* JedisConnection.eval() uses binary version of Jedis.eval()
* but JedisConnection.evalsha() uses string version of Jedis.evalsha()
* this commit changes JedisConnection.evalsha() to use binary version of Jedis.evalsha()

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Original Pull Request: #91
CLA: 88220140729064528 (Jungtaek Lim)