Fix small bug in Stats where custom groups for counters were ignored.
Merge pull request #866 from daisyzhou/develop

Fix small bug in Stats where custom groups for counters were ignored.
Update scald to more robustly look for scala lib jars
Fix whitespace per Ian's comments
Merge pull request #867 from twitter/jco/fix_travix_via_scald

Update scald to more robustly look for scala lib jars
Added implementation of PartitionSource with tests. Notes:

* For Cascading documentation on PartitionTaps, see: http://docs.cascading.org/cascading/2.5/userguide/html/ch08s07.html
* Implementation is very similar to existing TemplateSource
* User can pass in delimiter + pathFields, TemplateSource-style, OR a custom Partition. I've written tests for both
* Unlike a TemplateTap, a PartitionTap can be read from as well as written to. I haven't implemented this
* I wanted to add a flag to automatically discard the pathFields from the output tap prior to writing, discussed here: https://groups.google.com/forum/#!topic/cascading-user/w24BMQ6ZG10. Nobody replied so I've removed this functionality for now
Whoops, got path depth wrong. Always 1
Moved into correct folder path
Fix for:
[error] /home/travis/build/twitter/scalding/scalding-core/src/test/scala/com/twitter/scalding/PartitionSourceTest.scala:43: not found: value ???
14/05/01 23:31:51 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[error] def toTuple(partition: String, tupleEntry: TupleEntry): Unit = ???
Added support for user to specify which fields they want to include in their TSV output