Added base Web App functionalities and models. Minor fixes.

...app/code/rosetta/base_app/static/favicon/site.webmanifest

...rosetta/base_app/static/font-awesome/css/font-awesome.css

...tta/base_app/static/font-awesome/css/font-awesome.min.css

...osetta/base_app/static/font-awesome/fonts/FontAwesome.otf

...ase_app/static/font-awesome/fonts/fontawesome-webfont.eot

...ase_app/static/font-awesome/fonts/fontawesome-webfont.svg

...ase_app/static/font-awesome/fonts/fontawesome-webfont.ttf

...se_app/static/font-awesome/fonts/fontawesome-webfont.woff

...ta/base_app/static/font-awesome/less/bordered-pulled.less

.../code/rosetta/base_app/static/font-awesome/less/core.less

...osetta/base_app/static/font-awesome/less/fixed-width.less

...setta/base_app/static/font-awesome/less/font-awesome.less

...code/rosetta/base_app/static/font-awesome/less/icons.less

...ode/rosetta/base_app/static/font-awesome/less/larger.less

.../code/rosetta/base_app/static/font-awesome/less/list.less

...ode/rosetta/base_app/static/font-awesome/less/mixins.less

.../code/rosetta/base_app/static/font-awesome/less/path.less

...ta/base_app/static/font-awesome/less/rotated-flipped.less

...e/rosetta/base_app/static/font-awesome/less/spinning.less

...de/rosetta/base_app/static/font-awesome/less/stacked.less