Port printform-example to ExtJS 5.0.0
Changed inclusion method of ExtJS libs&resources

Replaced the old method of inlcuding local files with a copy of the include-ext.js
from the ext-examples. It will now load sources from http://cdn.sencha.io.
A little slower, but I think it's an enhancement, cause a local Ext-Version
would no longer be needed.

thx for the tip @bjornharrtell
Port printpreview-example to ExtJS 5.0.1
Port renderer-example to ExtJS 5.0.1
Use ExtJS utility methods.
Port stylegrid-example to ExtJS 5.0.1

Several changes where needed, that have to be reviewed:
- check if "meta" is defined in Symbolizer.js. meta is undefined after editing
  an cell.
- root-Keyword in readers in RasterStyleModel.js and VectorStyleModel.js
  are now dynamically set to ExtJS5s "rootProperty" or ExtJS4s "root".
- removed defaultValue: null in symbolizer-field. It now uses the
  ExtJS-default which is "undefined"
- dynamized the test to pass with ExtJS4 and ExtJS5
Port wfscapabilities-example to ExtJS 5.0.1

The workaround in the src/GeoExt/data/reader/WfsCapabilities don't seems
to be best practice but it's allready used in src/GeoExt/data/reader/Attribute.js
(3e79ffee14a4f7467244bd6d387e0fa301cd5a0) and just works fine.
Port wmscapabilities-example to ExtJS 5.0.1

The workaround in the src/GeoExt/data/reader/WmsCapabilities don't seems
to be best practice but it's allready used in src/GeoExt/data/reader/Attribute.js
(3e79ffee14a4f7467244bd6d387e0fa301cd5a0) and just works fine.
Rename bind and unbind functions in Slider classes

This renames the 'bind' and 'unbind' functions within the slider classes
of GeoExt because in ExtJS 5 it seems that 'bind' and 'unbind' are a kind
of reserved config properties (see
http://docs.sencha.com/extjs/5.0.1/#!/api/Ext.slider.Single-cfg-bind) so
our overwrite with a function enforces an exception in Ext.mixins.Bindable when
destroying a slider with its 'destroy' function.
Since 'bind' and 'unbind' were private functions a renaming seems
appropriate.
ZoomSlider and LayerOpacitySlider tests for ExtJS5

Adapted the tests for the Zoomslider and the LayerOpacitySlider to the new
mechanism so they are runnable either with ExtJS 4 or 5.
Port tree-example to ExtJS 5.0.1
Rename bind and unbind functions in LayerStore

see 3887196b47126440f3256fd26a182dd5232b337d
Adhere to stricter rules for itemId property

see 0214bbfd9fb6cd9711d24fc941c50dd0c7610aca
Cleaned constructor arguments
Add TODO wrt missing method afterEdit
Handle multiple records in remove-event.

see aaed903e69f0b36ebdd03c28beac5724768b4c16
Minor cleanups (Readability, Ext-Methods, ...)
fixed test for LayerStore