Improved included blocks management

BaseBlockCollection can now add, edit, remove and replace blocks
BlockManagerCollection can now add and remove recursively a child block
data-item property has been removed and replaced by data-name, which univocally identifies a child in the collection
updated TinyMceBlockBundle according changes in RedKite CMS
removed Menu1
converted AccordionBundle
fixed and refactore BlockManagerCollection because, sometimes, it does not save children
hide menu block toolbar when block is a child
renamed BlockManager getRenderingOptions to getEditorOptions
converted twitter bootstrap navbar