First try scss when there's an @import with comma (#2225)

It's annoying that the less parser is so lenient that it drops things instead of throwing :(

Fixes #2125

src/parser-postcss.js

@@ -209,7 +209,7 @@ function requireParser(isSCSS) {
 }
 
 function parse(text) {
-  const isLikelySCSS = !!text.match(/(\w\s*: [^}:]+|#){|\@import url/);
+  const isLikelySCSS = !!text.match(/(\w\s*: [^}:]+|#){|\@import[^\n]+(url|,)/);
   try {
     return parseWithParser(requireParser(isLikelySCSS), text);
   } catch (e) {

tests/css_scss/__snapshots__/jsfmt.spec.js.snap

@@ -1,5 +1,12 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`import_comma.css 1`] = `
+@import "rounded-corners", "text-shadow";
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+@import "rounded-corners", "text-shadow";
+
+`;
+
 exports[`scss.css 1`] = `
 @media #{$g-breakpoint-tiny} {}
 .#{$fa-css-prefix}-glass:before { content: $fa-var-glass; }

tests/css_scss/import_comma.css

@@ -0,0 +1 @@
+@import "rounded-corners", "text-shadow";