Bug 973741 - Linked CSS file path is wrong when server directory is same as file directory; r=pbrosset

--HG--
rename : browser/devtools/styleeditor/test/sourcemaps.css => browser/devtools/styleeditor/test/sourcemap-css/sourcemaps.css
rename : browser/devtools/styleeditor/test/sourcemaps.css.map => browser/devtools/styleeditor/test/sourcemap-css/sourcemaps.css.map
rename : browser/devtools/styleeditor/test/sourcemaps.scss => browser/devtools/styleeditor/test/sourcemap-sass/sourcemaps.scss