Extend annotator's hierarchy

[roddar92]

Approches:

• Create a set of preprocessors for new text:
• • Preprocessor() with def preprocess(self, text) + NewsCleanerPreprocessor() (delete date/time/location/newspaper_name around a new's header)
• Create a set of visualizatiors for annotator results:
• • ResultVisualizatior() + HTMLTableVisualizatior()

Example:

---

| l-context | entity | r-context | score. |

| a b c d | NE1 | e f | -0.5. | | a c d | NE121 | i j k e f | -0.5. |