Implement the RLike & Like in catalyst#224

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chenghao-intel wants to merge 5 commits intoapache:masterfrom

chenghao-intel:string_expression

Commits on Mar 25, 2014

Commits on Mar 26, 2014

change to spark code style
chenghao-intel
committed

Commits on Mar 27, 2014

Simplify the implementation/unit test of RLike/Like
chenghao-intel
committed

Commits on Mar 28, 2014

fix bug in RLike/Like & Simplify the unit test
chenghao-intel
committed