Main Class for query engine : com.mtk.ire.QueryProcessor

Other standalone main classes:

1. External Merge Sort
2. IndexGenerator (to index 53 gb wiki dump)
3. IndexCreator (to create primary and secondary index)

Implemented:

1. Single word queries
2. Multi word queries
3. Field queries
4. Phrase queries partially (using ngrams)
5. Additional little summary snippet (work in progress)