fix #866 Changing message when user tries to load a library already loaded

Changing from an error to a warning message since it's not breaking anything and the framework continues working properly.
fix #770 Multiple embed:Elements linked to page engine instances cause widget errors
fix #812 IE11 failing test.aria.widgets.form.textinput.onchange.OnChangeTestCase
fix #815 IE11 failing test.aria.widgets.form autocomplete.selectionKey.AutoComplete
fix #816 IE11 failing test.aria.widgets.form autocomplete.selectionKey.AutoCompleteModifier
fix #817 IE11 failing test.aria.widgets.form.autocomplete.spellcheck.SpellCheckTestCase
fix #818 IE11 failing test.aria.widgets.form.autocomplete.expandbutton.test2.ExpandButtonCheck
fix #819 IE11 failing test.aria.widgets.form.autocomplete.handler.test1.LCHandlerTestCase
fix #820 IE11 failing test.aria.widgets.form.autocomplete.caret.CaretTestCase
feat #883 Adding Japanese short version of months and days

Adding the possibility to use short version of months and days in japanese.
fix #886 jsdoc problem inside Browser class

Fixing the class description for aria.core.Browser

close #887
refactor remove verbosity from DOCTYPEs

Let's just use HTML5's <!DOCTYPE html> everywhere.
Also strip some indentation in `FrameATLoaderHTML` which is deployed
unminified.

Close #876.
fix #868 Introducing allowInvalidText property for Selectbox widget

Adding the possibility to define the allowInvalidText property in order to give to the user the possibility to write whatever he wants inside the input field of a selectbox widget.
doc Validation doc in utils.Data

Close #871.
feat #870 MultiAutoComplete widget

close #870