SPARKC-312: Implementing FilterOptimizer#1019

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ponkin:SPARKC-312

Commits on Aug 12, 2016

Commits on Aug 16, 2016

SPARKC-312: Introducing option spark.cassandra.sql.enable.where.clause.optimization + some more tests
ponkin
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Commits on Nov 19, 2016

SPARKC-312: Fixing review comments
Alexey Ponkin
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SPARKC-312: Resolving merge conflicts
Alexey Ponkin
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Commits on Nov 21, 2016

Fixing test: SparkSession instead of sqlContext
Alexey Ponkin
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