accordion: widgets and templates
Merge tracking branch 'infopark/develop' into feature/accordion
accordion widget generators
adds view to accordion generator
updates generator to include CSS and spec for AccordionWidget
generators for accordion panels
+ css definitions for nested accordion widget
accordion widget: simplify valid_widget_classes method
generator: accordion panel is invoked by the accordion generator
Merge branch 'feature/accordion' of github.com:spiderpug/infopark_kickstarter into feature/accordion

* 'feature/accordion' of github.com:spiderpug/infopark_kickstarter:
  generator: accordion panel is invoked by the accordion generator
  accordion widget: simplify valid_widget_classes method
  generators for accordion panels + css definitions for nested accordion widget
  updates generator to include CSS and spec for AccordionWidget
  adds view to accordion generator
  accordion widget generators
  accordion: widgets and templates
refactor accordion widget

+ use new widget pool structure
+ merge both accordion generator into one
+ remove locales
+ remove app spec and update generator spec
+ minor cleanup
update to bootstrap 3 panels
update example migration after widget reform
remove padding for nested widgets
allow to use widgets inside the panel
bugfix: fix that the example migration creates the nested widgets
remove accordion css

+ this is handled by the more generic nested widget css
update show view, so that nested widget edit markers are placed correctly
add accordion widget javascript to unfold on edit
add example widgets into the panel
prevent collapse when editing the headline