added unit test for MapPane
removed serializable from Coordinate & changed method names for latitude/longitude
removed unused imports
removed useless comment
added field for api key
extended factory for bing default map
Refactor BingType to avoid the usage of toString()
added generics to factories
changed max zoom for bing
added API key parameter for constructor of the factory; fixed test
Merge pull request #1 from gorskima/2.2

Refactor BingType to avoid the usage of toString()
merged
introduced builder for tile path
removed unused imports
fixed imports; added javadoc
kept cache with repository by using a change listener; moved constant
changed location of logo
removed loading of attributton
Revert "removed loading of attributton"

This reverts commit 51601899919539cb780ea786fc6c4d85cb0670da.
added factory which requires a api key; renamed BingTileSource again, since it is a specialized subclass only for images; changed attributon image: it is loaded in a factory and set in the tile source; extended test for map pane; fixed copyrights for BingAerial