Replace default buffer value to 100 GB, changed buttons to use String notation, removed default buffer parameter in UI URLs

Added byte range, page title with log name, previous/next bytes buttons, initialization to end of log, large default buffer, buggy back to master link

Fixed SPARK-795 with explicit dependencies

Remove some stack traces from sbt test output

Added "Labeled" to util functions for labeled data

Make binSearch method tail-recursive for RidgeRegression

1. Set akka log level to ERROR before shutting down the actorSystem.
This avoids akka log messages (like Spray) from falling back to INFO
on the Stdout logger
2. Initialize netty to use SLF4J in LocalSparkContext. This ensures that
stack trace thrown during shutdown is handled by SLF4J instead of stdout

update guava version from 11.0.1 to 14.0.1