Import Porter2 library from http://snowball.tartarus.org. It is allowed
by Prof. :)
constructIndexer should be refactored to be prepared for huge size input
file. Thus, for the time being, IndexerInvertedCompressed will extent
Indexer directly and two utility methods which were in IndexerCommon
have been pulled up to Indexer.
pull up common data field
Ignore huge size input data file directory
Merge branch 'master' of git@github.com:oveis/Web_Search_Engine.git
Intermediate commit of compression indexer