boolean retrieval, supporting AND,OR,NOT,parentheses
minor changes on format
changes in project name
query supports "&" "|" "!"
support new grammar
add postings.*
temporary backup for reformat
bug: null string in term map
fix null-term-bug
support near & phrase query
support porter stemmer
refactor codes
todo list
clean data
mv data out
add edit distance
change hier
seperate concept of "word" and "term"
add new field: grams, refact indexsearcher out of indexreader
refator searcher