better logging
make things that look like closeables implement Closeable
Merge pull request #27 from Parquet/make_closeable

make things that look like closeables implement Closeable
fix bug where a required field would not be created at the right level
Merge pull request #29 from Parquet/fix_definition_level_for_nested_required

fix bug where a required field would not be created at the right level
Merge branch 'master' into dictionary_encoding

Conflicts:
	parquet-hadoop/src/main/java/parquet/hadoop/ParquetFileReader.java
mae dictionary more generic; allow converters to understand dictionaries
make converters dictionary aware