Add comment headers to all source files except for reportal plugin.
Initial Parquet file viewer.
Add header comments to Reportal source files.
Parquet file viewer now working. Replace Avro 1.4 JAR in HDFS viewer with Avro 1.7.4 JAR to fix API mismatch issue.
Style changes.
Catch Throwable in ParquetFileViewer in order to log any other exception if they are thrown.
Merge pull request #9 from davidzchen/add_comments

Add comments.
Many thanks to David.
Merge pull request #10 from davidzchen/parquet_hdfs_viewer

Parquet HDFS viewer.
Thanks, David.