Default Fields of TextLine for Local and Hadoop don't match

Noticed that if you use TextLine in local mode, the default Fields are "num" and "line". If you use hdfs mode, the default values are "offset" and "line".

So I just added a Fields object, with "offset" and "line", when constructing the local TextLine.

Local TextLine in cascading:
https://github.com/cwensel/cascading/blob/wip-2.1/cascading-local/src/main/java/cascading/scheme/local/TextLine.java