Add more suitable popup anchors fordeafult styles

Added a suitable anchor image for each default theme and created a
theme-specific popup file which can be included into the GeoExt-app.
set the classic theme anchor as default anchor
Popup-example loads the correct popup-CSS-file

The popup-example now loads the popup-CSS-file depending on the chosen
theme by the theme-switcher-combo. So the correct anchor is shown when
opening the popup in the example-app.
added existing examples to jsduck (with screenshots)
changing wms in examples, added new build for mvc app
Add a common example CSS.
Use common example CSS in examples.
Remove inline CSS declarations where possible.
Merge pull request #262 from marcjansen/attribution-style

Add and use a common CSS-file for examples
Merge pull request #257 from chrismayer/more-popup-anchors

Merge More theme-specific popup anchors (r @bartvde & @marcjansen)
replacing wms capabilities
Merge pull request #260 from weskamm/wmschange

changing the wms in most examples
Same approach for tree theme specific css as used for popup
Add comment about including css in the API docs
Merge pull request #263 from bartvde/cssfixes

Same approach for tree theme specific css as used for popup (r=@marcjansen)
First working example with screenshots, cropping and waiting for
ext.onready
Merge pull request #258 from hutzelknecht/master

This PR brings the Examples in http://geoext.github.io/geoext2/ to JSDuck on http://geoext.github.io/geoext2/docs/.
VectorLegend should require FeatureRenderer
Merge pull request #265 from bartvde/requires2

VectorLegend should require FeatureRenderer (trivial change only in dependencies)
addClass has been renamed to addCls