Add .disabled class styling for .btn-styles
Add .disabled class styling for .btn-styles

Bootstrap itself has .btn-default.disabled styled. IE8 with angularjs has some weird behaviour if anchor has disabled attribute set, so I use disabled class as a workaround and assume the .disabled class styles the buttons the same as disabled attribute would.
ammula88/bootstrap,ammula88/bootstrap,ammula88/bootstrap,ammula88/bootstrap