* src/main/java/jgreg/internship/nii/WF/Pipeline.java: Add comments
* src/main/java/jgreg/internship/nii/RES/MappingRES.java: New resource to store the mapping class -> filename*

* src/main/java/jgreg/internship/nii/AE/SentimentFinderAE.java,
* src/main/java/jgreg/internship/nii/WF/Pipeline.java: Use MappingRES
Rename Pipeline to AnnotatorWF and move App.main to AnnotatorWF.main

Splitting WF is good
XMIWriter Generalization (WIP)
* src/main/java/jgreg/internship/nii/AE/XMIWriter.java: Generalized version of XMIWriter

The filename can be retrieved from a user-defined feature.