new animation feature implemented
minor cleaning of the sample
Merge branch 'ToasterWithDifferentAnimationFeature' into Toaster
Refactored refreshRendering to make it easier to override the default
behaviour of message removal
Changement placement apî

Now takes only a placement css class
classList call replaced with domClass
Minor refactoring
Changement behaviour of `type` property

now it's case sensitive and raises an exception when it's not undefined
or a know type;