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LuceneKit TODO
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    * Implement all FIXME.
    * Replace hard-written "segments" and "deletable" with static NSString
      (INDEX_SEGMENTS_FILENAME, INDEX_DELETABLE_FILENAME).
    * Move private methods into category in class implementation 
      to reduce the headers.
    * Lock and Multithread.
    * Index files compatible with other implementation.
    * LCSortField_AUTO (regular expression library required).
    * Implement following classes:
      org.apache.lucene.analysis.standard
      org.apache.lucene.queryParser
	  org.apache.lucene.search.spans
	  org.apache.lucene.search.ParallelMultiSearcher
	  org.apache.lucene.index.ParallelReader