Added base Web App functionalities and models. Minor fixes.

...ns/mimetypes/gnome-mime-application-x-python-bytecode.png

...p/static/icons/mimetypes/gnome-mime-application-x-rar.png

...p/static/icons/mimetypes/gnome-mime-application-x-rpm.png

...atic/icons/mimetypes/gnome-mime-application-x-scribus.png

.../icons/mimetypes/gnome-mime-application-x-shellscript.png

...ns/mimetypes/gnome-mime-application-x-shockwave-flash.png

...atic/icons/mimetypes/gnome-mime-application-x-stuffit.png

...p/static/icons/mimetypes/gnome-mime-application-x-tar.png

.../static/icons/mimetypes/gnome-mime-application-x-tarz.png

...p/static/icons/mimetypes/gnome-mime-application-x-tex.png

...p/static/icons/mimetypes/gnome-mime-application-x-zip.png

...atic/icons/mimetypes/gnome-mime-application-xhtml+xml.png

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

...etta/base_app/static/icons/mimetypes/gnome-mime-audio.png

...etta/base_app/static/icons/mimetypes/gnome-mime-image.png

.../base_app/static/icons/mimetypes/gnome-mime-text-html.png

...pp/static/icons/mimetypes/gnome-mime-text-vnd.wap.wml.png

...base_app/static/icons/mimetypes/gnome-mime-text-x-csh.png

...e_app/static/icons/mimetypes/gnome-mime-text-x-python.png

.../base_app/static/icons/mimetypes/gnome-mime-text-x-sh.png