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PARQUET-457: Verify page deserialization for GZIP and SNAPPY codecs, related refactoring

This also restores passing on user's `CMAKE_CXX_FLAGS`, which had unfortunately led some compiler warnings to creep into our build.

Author: Wes McKinney <wesm@apache.org>

Closes #58 from wesm/PARQUET-457 and squashes the following commits:

4bf12ed [Wes McKinney] * SerializeThriftMsg now writes into an OutputStream. * Refactor page serialization in advance of compression tests * Test compression roundtrip on random bytes for snappy and gzip * Trying LZO compression results in ParquetException * Don't lose user's CMAKE_CXX_FLAGS * Remove Travis CI directory caching for now * Fix gzip memory leak if you do not call inflateEnd, deflateEnd

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