Style cleanup and other miscellanea (javadoc, etc)

Added other review comments as TODOs
More cleanup/renames
Merge remote-tracking branch 'origin/master'

Conflicts:
	parquet-column/src/main/java/parquet/column/primitive/DevNullColumnReader.java
	parquet-column/src/main/java/parquet/column/primitive/PrimitiveColumnWriter.java
	parquet-hadoop/src/main/java/parquet/format/converter/ParquetMetadataConverter.java
	parquet-hadoop/src/main/java/parquet/hadoop/ColumnData.java
	parquet-hadoop/src/main/java/parquet/hadoop/PageConsumer.java
	parquet-hadoop/src/test/java/parquet/hadoop/TestInputFormat.java
	parquet-hadoop/src/test/java/parquet/hadoop/TestReadIntTestFile.java
Merge pull request #3 from toddlipcon/master

Some misc cleanups, review comments for Julien
cleanup
Merge branch 'master' of github.com:Parquet/parquet-mr
Update README.md
Fix pom.xml

 - GroupId for parquet-format is now com.twitter
Merge pull request #5 from mickaellcr/fix_pom

Fix pom.xml
Merge branch 'master' of github.com:Parquet/parquet-mr