Remove duplicate documentation of options (which was out of date).
Remove vestigial hack.
Support scalding modules with --hdfs.
Merge pull request #789 from fs111/develop

cascading and cascading-jdbc have different release cycles.
Merge pull request #788 from ljrittle/module-support-with-hdfs-mode-in-scald.rb

Module support with hdfs mode in scald.rb
use latest bugfix release of cascading-jdbc-core by default