[Yaml] Fix comment containing a colon on a scalar line being parsed as a hash.
Merge branch '2.2' into 2.3

* 2.2:
  [Routing] fix phpdoc
  [Yaml] Fix comment containing a colon on a scalar line being parsed as a hash.
Merge branch '2.3'

* 2.3:
  [Routing] fix phpdoc
  [Form] Extracted ReferencingArrayIterator out of VirtualFormAwareIterator
  [Yaml] Fix comment containing a colon on a scalar line being parsed as a hash.
  [Form] Added a test that ensures that setData() reacts to dynamic modifications of a form's children
  [Form] Removed exception in Button::setData(): setData() is now always called for all elements in the form tree during the initialization of the tree
  [Form] Removed call to deprecated method
  [Form] PropertyPathMapper::mapDataToForms() *always* calls setData() on every child to ensure that all *_DATA events were fired when the initialization phase is over (except for virtual forms)
  [Form] Removed superfluous reset() call
  [Form] Fixed: submit() reacts to dynamic modifications of the form children