Fix a memory leak.
1. Remove context. 2. Change the word pos to the char pos in the document. 3.Calculate the word count. 4. Modify parser.
Remove pos array in inverted index. Write Freq and single Pos.
implement skip forward by posting
Implement vbyte compression.
Deal with word to long.
deal with error data.
Fix performance issue.
revise time statics.
ignore it.
Merge branch 'vbyte'