Fix broken import in vtm-jeo project.

Resolves the following build error:

```
$ ./gradlew clean install
...
:vtm-jeo:compileJava
/usr/local/code/vtm/vtm-jeo/src/org/oscim/layers/JeoTileSource.java:10: error: cannot find symbol
import org.jeo.data.Tile;
                   ^
  symbol:   class Tile
  location: package org.jeo.data
/usr/local/code/vtm/vtm-jeo/src/org/oscim/layers/JeoTileSource.java:42: error: cannot find symbol
					Tile t = mTileDataset.read(tile.zoomLevel, tile.tileX,
					^
  symbol: class Tile
2 errors
:vtm-jeo:compileJava FAILED

FAILURE: Build failed with an exception.
...
```