The UTFGrid layer's `getTileInfo` method was not correctly handling dateline wrapping (and was a bit more complicated than it needed to be). Since it would be useful to all grid layers to be able to retrieve a tile and pixel offset for any map location, this functionality deserves to be on the Grid layer.
The WMTS layer currently exposes a `getTileInfo` method that is used within the layer and by the WMTSGetFeatureInfo control. This method could be renamed to `getRemoteTileInfo` or something to differentiate it from a method that gets locally cached tile info. Until that change is made, the method on the Grid layer will be called `getGridData`.
The zoom control allows for zoom in/out links that can be styled with CSS.
Note: This change was originally captured in #269. It involves nice additions thanks @ahocevar. The changes were unintentionally merged and then reverted with fb3caf1561, so the history of commits is not immediately apparent (though still likely there somewhere due to the magic of git).
Having to call two methods to get complete feature information (id and data) is cumbersome. The `getFeatureInfo` method returns an object with both feature id and data.
I think it should be the job of the layer to retrieve data for a given location (instead of the control). The first part of this change creates a `getData` method on the layer and updates the control to use this method.
The second part of this change removes the assumption that the data returned will be an simple object representing feature attributes. The UTFGrid specification doesn't say anything about the structure of property values in the optional data member. The examples given in the spec use string values. The default callback previously assumed that the data could be rendered in a two column table. I think it would make more sense not to make this assumption. With this change, the user must always provide a callback to do anything with returned data.
This allows us to simplify the map and layer configuration, because now the projection also defines defaults for maxExtent, maxResolution and units.
This change also adds transforms for SRS aliases for EPSG:4326 and centralizes axis order information in OpenLayers.Projection.defaults.
