Add 'view' keyword, and minor adjustments to 'search' key word

Great plug-in Japh!

Maybe these should have been separate pull requests... (but I committed them individually so you can always cherry pick :) ).

First adjustment is to use `get_edit_post_link()` rather than manually building the admin url - since some may be using the `get_edit_post_link` filter.

Secondly I've added a synonym for 'search': 'edit'. As the link for both points to the edit page of the post found. (When trying out the plug-in I originally tested with 'edit' to see if any feature like this existed). 

(On a side note, maybe the search should be restricted to post title?  Sometimes searching the title doesn't bring up the desired post - or it disappears as I type its name).

Lastly I've added a 'view' keyword.