PARQUET-1043: Raise minimum CMake version to 3.2, delete cruft.
PARQUET-1043: Raise minimum CMake version to 3.2, delete cruft.

Also fixes a gcc 4.8 buglet (std::vector::erase does not accept a const_iterator in gcc 4.8)

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

Closes #361 from wesm/PARQUET-1043 and squashes the following commits:

4451c5c [Wes McKinney] Raise minimum CMake version to 3.2, delete cruft. Fix gcc 4.8 buglet with std::vector::erase

Change-Id: I41793599f5ea8e07d16a850e9b43af812a1814a3

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