rename data.model.Layer to data.Layer
Merge branch 'master' of https://github.com/geoext/geoext2 into popup

Conflicts:
	examples/popup/popup.html
Adjust LayerModel & LayerStore references in other classes
Migrated documentation to jsduck format
Merge branch 'master' of https://github.com/geoext/geoext2
Cleaned up the popup exmaple. No functional change.
start adding back the legend tests
Merge branch 'master' of https://github.com/geoext/geoext2
build buttons from actions
Change file paths in examples for LayerStore & LayerModel
Merge branch 'master' of github.com:geoext/geoext2
fix up calls to Ext.create in legend tests
Merge pull request #22 from mpriour/master

change layer store & model class names & paths
Removed configuration options 'mapCenter', 'mapZoom' & 'mapExtent' in favor of 'center', 'zoom' & 'extent'.
Moved initialisation of 'zoom', 'center' & 'extent' outside of the 'config'. We do not want getters/setters/appliers for these properties.
fix Ext.create calls now for real
Fix layer store refs in map panel class
Merge pull request #24 from mpriour/master

Fix layer store refs in mappanel
Modify map panel example to use autoloader
Merge pull request #25 from mpriour/autoloader

Modify map panel example to use autoloader. Closes #17, closes #19, closes #21