Fix: Parser breaks when an end parenthesis occurs in a quoted string

Closes #56
Closes #77

lib/parse.js

@@ -237,7 +237,7 @@ CSSOM.parse = function parse(token) {
 			}
 			break;
 
-		case '(':
+		case "(":
 			if (state === 'value') {
 				// ie css expression mode
 				if (buffer.trim() === 'expression') {
@@ -250,17 +250,19 @@ CSSOM.parse = function parse(token) {
 						i = info.idx;
 					}
 				} else {
-					index = token.indexOf(')', i + 1);
-					if (index === -1) {
-						parseError('Unmatched "("');
-					}
-					buffer += token.slice(i, index + 1);
-					i = index;
+					state = 'value-parenthesis';
+					buffer += character;
 				}
 			} else {
 				buffer += character;
 			}
+			break;
 
+		case ")":
+			if (state === 'value-parenthesis') {
+				state = 'value';
+			}
+			buffer += character;
 			break;
 
 		case "!":

spec/parse.spec.js

@@ -401,6 +401,28 @@ var TESTS = [
 			return result;
 		})()
 	},
+	{
+		input: "body{background-image: url(')');}",
+		result: (function() {
+			var result = {
+				cssRules: [
+					{
+						selectorText: 'body',
+						parentRule: null,
+						style: {
+							0: 'background-image',
+							'background-image': "url(')')",
+							length: 1
+						}
+					}
+				],
+				parentStyleSheet: null
+			};
+			result.cssRules[0].parentStyleSheet = result;
+			result.cssRules[0].style.parentRule = result.cssRules[0];
+			return result;
+		})()
+	},
 	{
 		input: ".gradient{background: -moz-linear-gradient(/*);*/top, #1E5799 0%, #7db9e8 100%)}",
 		result: (function() {