Fix multiple words in search U4-2509

When multiple words are entered in the search field no results are
returned.
This pull req. contains the fix suggested by Tony.
Improved admin search splitting query U4-2509
Improved search with "and", partial match U4-2509

- added partial matching on each word.
- fixed bug so 'all' words match rather than 'any' words.
Merge pull request #135 from Myster/master

Fix multiple words in search U4-2509