page-fragments: message fragment refactoring
page-fragments: notify fragment introduced
metamer: added default value for @id in attributes template
metamer: AbstractWebDriverTest: added another methods for testing events and HTML attributes
metamer: moved templates for testing pages of input validation and message components, created test base for message(s) component, rich:message(s) tests refactored
metamer: reorganized and added samples and tests for rich:notify* -- stack, message, messages, notify . Added attributes to AttributeList.
metamer: pulled up common method for message components
metamer: rich:notify*: put failing tests to 'Future' group
metamer: updated testng XMLs