Use ContextUtil in tests to avoid dependency on parts of new MR API
that are incompatible between MR1 and MR2.
Rename ParquetInputFormat#addInputPathRecursively to avoid
clash with non-static Hadoop 2 method of same name on FileInputFormat.
Fix syntax error in test that Pig 0.12 complains about.
Merge pull request #248 from tomwhite/hadoop-2-compatibility-fixes

More Hadoop 2 compatibility fixes