Merge pull request #297 from KaiVolland/extjs5

Port printextent-example to ExtJS 5.0.0
Merge pull request #298 from KaiVolland/extjs5

Fixed the test for PrintExtent
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.
Merge pull request #301 from chrismayer/sliders-tests-ready-extjs5

Adapted tests for slider classes with ExtJS5
Merge pull request #304 from KaiVolland/extjs5

Extjs5
Merge branch 'extjs5' of https://github.com/KaiVolland/geoext2 into KaiVolland-extjs5

Conflicts:
	tests/slider/LayerOpacity.html
	tests/slider/Zoom.html
Merge branch 'KaiVolland-extjs5' into extjs5
Fix the failing test in v.4 and v.5
Merge pull request #315 from marcjansen/extjs5-search-action-test

Fix the failing SearchAction test in v.4 and v.5