fix: case insensitivity of @import (#514)

Author: evilebottnawi

lib/processCss.js

@@ -41,7 +41,7 @@ var parserPlugin = postcss.plugin("css-loader-parser", function(options) {
 		}
 
 		if(options.import) {
-			css.walkAtRules("import", function(rule) {
+			css.walkAtRules(/import/i, function(rule) {
 				var values = Tokenizer.parseValues(rule.params);
 				var url = values.nodes[0].nodes[0];
 				if(url.type === "url") {

test/importTest.js

@@ -9,6 +9,12 @@ describe("import", function() {
 	], "", {
 		"./test.css": [[2, ".test{a: b}", ""]]
 	});
+	test("import camelcase", "@IMPORT url(test.css);\n.class { a: b c d; }", [
+		[2, ".test{a: b}", ""],
+		[1, ".class { a: b c d; }", ""]
+	], "", {
+		"./test.css": [[2, ".test{a: b}", ""]]
+	});
 	test("import with string", "@import \"test.css\";\n.class { a: b c d; }", [
 		[2, ".test{a: b}", ""],
 		[1, ".class { a: b c d; }", ""]