browser_side: heavy refactorisation for microblogs: - RichTextEditor inheritates from BaseTextEditor - stuff related to display/edition have been moved from MicroblogEntry to LightTextEditor and RichTextEditor. Now the editors has two modes for display/edition and the microblog bubble is actually the editor itself. - RichTextEditor's display mode uses a LightTextEditor (this will be used for WYSIWYG edition) - addressing stuff of RichTextEditor have been moved to a child class RichMessageEditor (used for the rich text editor when clicking on the button left to the unibox) - handle blog titles TODO: - fix encode/decode errors when sending special chars - fix images maximal width in the bubble - rich content WYSIWYG edition