Graticule tab in print preview

New widget to control graticule in print preview. Whe can manage this paramaters:

* Activate/deactivate graticule (all other options maybe disabled when this checkbox is not checked)
* Graticule color
* Label style (size, family, decoration: bold and italic)
* Translations

This commit fixes #243.

An example of use it's available in queryConfig:
```
}, {
    "ptype": "gxp_print",
    "customParams":{
            "outputFilename":"mapstore-print"
    },
    "printService": "http://localhost:8080/geoserver/pdf/",
    "legendPanelId": "legendPanel",
    "appendLegendOptions": true,
    "addGraticuleControl": true,
    "legendOnSeparatePage": true,
    "addLandscapeControl": true,
    "actionTarget":{
        "target": "paneltbar",
            "index":4
    }
}, {
```

Also, when you active this option in the print plugin, the `bboxFit` it's also enabled (view #241)

This pull request includes a minor fix for the `LegendStylePanel` in IE.