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PARQUET-818: Refactoring to utilize common IO, buffer, memory management abstractions and implementations

This refactoring is a bit of a bloodbath, but I've attempted to preserve as much API backwards compatibility as possible.

Several points

* Arrow does not use exceptions, so will need to be very careful about making sure that no Status goes unchecked. I've tried to get most of them, but might have missed some
* parquet-cpp still exposes an abstract file read and write API as before, but this makes it easy to pass in an Arrow file handle (e.g. HDFS, OS files, memory maps, etc.)
* Custom memory allocators will need to subclass `arrow::MemoryPool` instead. If this becomes onerous for some reason, we can try to find alternatives, but basically it's the exact same class as `parquet::MemoryAllocator`

Does not require any upstream changes in Arrow.

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #210 from wesm/arrow-consolidation and squashes the following commits:

ef81084 [Wes McKinney] Configurable Arrow linkage. Slight .travis.yml cleaning
50b44f0 [Wes McKinney] Make some const refs
8438f86 [Wes McKinney] Revert ParquetFileReader::Open to use std::unique_ptr<RandomAccessFile>
671d981 [Wes McKinney] Actually tee output to console
ca8df13 [Wes McKinney] Do not hide test output from travis logs
f516115 [Wes McKinney] Add public link libs to dependencies to avoid race conditions with external projects
414c75f [Wes McKinney] README cleanups
be1acb5 [Wes McKinney] Move thirdparty ep's / setup to separate cmake module
46342ea [Wes McKinney] Remove unneeded ParquetAllocator interface, cleaning
b546f08 [Wes McKinney] Use MemoryAllocator alias within parquet core
8c1226d [Wes McKinney] Add Arrow to list of third party deps. Needs to be added to thirdparty
f9d8a2a [Wes McKinney] Check some unchecked Statuses
0d04820 [Wes McKinney] Fix benchmark builds. Do not fail in benchmarks if gtest.h is included due to <tr1/tuple> issue
ee312af [Wes McKinney] ... (continued)

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