New features

- Added Raw Visualization
- Added size filter slider; can be enable/disable from `facet.json`
- Dynamic grid columns from `facet.json`. For more modification see [this][1] and [this][2]

[1]: http://ui-grid.info/docs/#/api/ui.grid.class:GridOptions.columnDef
[2]: http://ui-grid.info/docs/#/tutorial/401_AllFeatures#Example