Added class for entity extractor
Refactored code to run opinion,scale,TA parallel

* 3 separte functions to generate the JSON
* for opinion and scale the solutions are provided from within the
* functions themeselves
* for TA need to add function based on TA type
Modified testClass to run the system
Modified TA Class to generate basic TA Obj

* Returns a list of basic TA Obj- sentences,tokens,POSTag,chunks