remove dead code
enhance the term query, do simple stemming and only query the 1st word

1) use word.split(' ').[0] to ensure only the 1st word is searched even
there are multiple words selected with right click
2) worked out a tricky solution to do word stemming, i.e. if you search
'words', it will get 'word' first, thenn get the definition
Update README
set version number to 0.2