Pluggable spatial selector.

Perform a pluggable spatial selector and use it on a new query form `SpatialSelectorQueryForm`.

Implemented plugins:

* BBOX spatial selector
* Buffer spatial selector
* Polygon spatial selector
* Circle spatial selector
* Geocoder spatial selector

This commit also include:

* Minor fixes on WPS manager and procces
* Example configuration for the new query form on `mapcomposer/app/static/config/spatialSelectorQueryConfig.js`
Spatial selector translations.

Add tranlated strings for en/es/it languages
Spatial selector changes.

* Fixes layout bug on geocoder
* Add support for geocoder without WPS union
* Add some code docs.
Fixes #330: added removeTools configuration support
Merge pull request #331 from mbarto/tools_removal

Fixes #330: added removeTools configuration support
Geocoder selector change.

Hide add and clean botton on simple selection of the geocoder.
Geocoder minor fixes

* Minor change on geocoder layout for simple selection
* Append `ignoreExtraDims` on wfs search combo
Geocoder fixes.

* Make WFS search combo output format configurable.
* Add option on the Geocoder to select different output format for the WFS search combo.
Fix ISSUE 329. Add STYLES parameter, even if empty
SpatialSelector fix

Remove old code on expand listener. Fix expand bug.
Spatial selectors plugins changes

* Include selection summary by default
* Change default styles
Remove deprecated plugin

Remove BBOXQueryForm plugin. We're going to use the SpatialSelectorQueryForm.
Update queryConfig.js

Include new plugin on the demo configuration.
Spatial Selector Query form changes

* Remove unused configuration on config examples
* Minor bug fix when no ROI selected --> use map extension
Merge pull request #333 from alediator/spatial_selector_plugin

Proposal #3: Pluggable SpatialSelector and SpatialSelectorQueryPanel
MAPSTORE-9 add qr code support for maps
MAPSTORE-9 fixed compatibility with IE8 and previous
Feature grid improvements

* Add `exportFormats` and `exportFormatsConfig` options to this widget.
* Add images and styles for the new exports
* Minor fix on Circle spatial selector.

You can test it adding the feature grid with this configuration:

```
	    {
		  "ptype": "gxp_featuregrid",
		  "featureManager": "featuremanager",
		  "outputConfig": {
			  "id": "featuregrid",
			  "title": "Features"
		  },
		  "outputTarget": "south",
		  "exportFormats": ["CSV","shape-zip","excel", "excel2007"]
	    }
```
MAPSTORE-11 add qrcode in home page
Feature grid improvements

* Export action as window by default
* Es/en translations for new options