arrow

ARROW-4: This provides an partial C++11 implementation of the Apache Arrow data structures along with a cmake-based build system. The codebase generally follows Google C++ style guide, but more cleaning to be more conforming is needed. It uses googletest for unit testing.

Feature-wise, this patch includes:

* A small logical data type object model
* Immutable array accessor containers for fixed-width primitive and list types
* A String array container implemented as a List<byte>
* Builder classes for the primitive arrays and list types
* A simple memory management model using immutable and immutable buffers and
  C++ RAII idioms
* Modest unit test coverage for the above features.