Merge pull request #112 from henrylinkedin/master

Fix the error handling on hourly to ignore certain kafka error codes, fixed the bug on reprocessing on sweeper
Adding support for dynamically determining topics that don't contain the dedup key used in the sweeper
adding support to the sweeper for topics within nested directories
fix for recursion issue
Update README.md

adding some more instructions to README
changing the sweeper job to use SchemaValidator to determine if the key is compatible with topics schema.
updating avro version
Update the RelaxedAvroKeyOutputFormat based on Avro 1.7.7 method signature
Merge remote-tracking branch 'upstream/master'
Fix the offset calculation, we don't use beginOffset anymore
Add classpath/classloader debugging on avro classes
Add classpath debugging for avro classes for sweeper