PARQUET-728: Incorporate upstream Arrow API changes

I bumped the thirdparty git hash to Arrow trunk. Pardon the diff noise from clang format. Also resolves PARQUET-729.

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

Closes apache#167 from wesm/PARQUET-728 and squashes the following commits:

222e72c [Wes McKinney] Write multiple columns in file-serialize-test. Fix PARQUET-729
ef56871 [Wes McKinney] Incorporate upstream Arrow API changes, clang format with LLVM 3.8.0

Change-Id: I673b1538c93623ae50ebf70cd8d9c7048781c982

Author: wesm

cpp/tools/parquet/parquet-scan.cc

@@ -17,8 +17,8 @@
 
 #include <ctime>
 #include <iostream>
-#include <memory>
 #include <list>
+#include <memory>
 
 #include "parquet/api/reader.h"
 

cpp/tools/parquet/parquet_reader.cc

@@ -16,8 +16,8 @@
 // under the License.
 
 #include <iostream>
-#include <memory>
 #include <list>
+#include <memory>
 
 #include "parquet/api/reader.h"