Added base Web App functionalities and models. Minor fixes.

...tic/icons/mimetypes/gnome-mime-application-magicpoint.png

.../static/icons/mimetypes/gnome-mime-application-msword.png

...app/static/icons/mimetypes/gnome-mime-application-ogg.png

...app/static/icons/mimetypes/gnome-mime-application-pdf.png

...tic/icons/mimetypes/gnome-mime-application-postscript.png

...app/static/icons/mimetypes/gnome-mime-application-rtf.png

...cons/mimetypes/gnome-mime-application-vnd.lotus-1-2-3.png

...c/icons/mimetypes/gnome-mime-application-vnd.ms-excel.png

...ns/mimetypes/gnome-mime-application-vnd.ms-powerpoint.png

...-mime-application-vnd.oasis.opendocument.presentation.png

...e-mime-application-vnd.oasis.opendocument.spreadsheet.png

...nome-mime-application-vnd.oasis.opendocument.text-web.png

...es/gnome-mime-application-vnd.oasis.opendocument.text.png

...etypes/gnome-mime-application-vnd.rn-realmedia-secure.png

...mimetypes/gnome-mime-application-vnd.rn-realmedia-vbr.png

...ons/mimetypes/gnome-mime-application-vnd.rn-realmedia.png

...imetypes/gnome-mime-application-vnd.stardivision.calc.png

...types/gnome-mime-application-vnd.stardivision.impress.png

...etypes/gnome-mime-application-vnd.stardivision.writer.png

...ons/mimetypes/gnome-mime-application-vnd.sun.xml.calc.png