Extend input params for cmdSearch

:Release Notes:
added new parameters for cmdSearch command: "extended" and "max".

:Detailed Notes:
added new parameters for cmdSearch command:
-param extended If set as true, engine will generate more suggestions in output (=60). Can be ommited.
-param max Maximum number of words for output result, by default is 10. This parameter have priority over parameter 'extended'. Can be ommited.

:Testing Performed:
Was tested on Starfish build 236

:QA Notes:
-produce 60 or less suggestions:
luna-send -n 1 -f palm://com.palm.smartKey/search '{ "query": "hallo", "context": "start", "quick": "false", "extended": true}'
- produce 10 suggestions:
luna-send -n 1 -f palm://com.palm.smartKey/search '{ "query": "hallo", "context": "start", "quick": "false", "extended": false}'
- produce 5 suggestions:
luna-send -n 1 -f palm://com.palm.smartKey/search '{ "query": "hallo", "context": "start", "quick": "false", "max": 5}'

:Issues Addressed:
GF-10137 Extend input params for cmdSearch

Open-webOS-DCO-1.0-Signed-off-by: Igor Kuksyuk <ikuksyuk@luxoft.com>

Change-Id: Ib8c22ffb693787a6e57fec4c8bd48c57c537186c
Reviewed-on: https://g2g.palm.com/2865
Reviewed-by: Build Verification
Reviewed-by: Igor Kuksyuk <ikuksyuk@luxoft.com>
Tested-by: Igor Kuksyuk <ikuksyuk@luxoft.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>