Update plitt.js

add index for each plitt link, so FF's quick find(') works
Update plitt.js to adapt current google search result page
remove google plus user icon from search result
now use parent h3.r to locate the links
rename a -> r to align with css class name
Merge branch 'toksea'

I adoped the fix, with some simplification.

However I put the google plus icon related logic on hold so that
I can get PLITT back to work first.

* toksea:
  remove google plus user icon from search result
  Update plitt.js to adapt current google search result page
  Update plitt.js