Merge pull request #4 from ericf/match-impl

Add support for deprecated `device-pixel-ratio` media feature

Author: tilomitra

index.js

@@ -59,6 +59,7 @@ function matchQuery(mediaQuery, values) {
 
                 case 'aspect-ratio':
                 case 'device-aspect-ratio':
+                case /* Deprecated */ 'device-pixel-ratio':
                     expValue = toDecimal(expValue);
                     value    = toDecimal(value);
                     break;
@@ -95,7 +96,7 @@ function parseQuery(mediaQuery) {
         parsed.type    = type ? type.toLowerCase() : 'all';
 
         // Split expressions into a list.
-        expressions = expressions.match(/\([^\)]+\)/g);
+        expressions = expressions.match(/\([^\)]+\)/g) || [];
 
         parsed.expressions = expressions.map(function (expression) {
             var captures = expression.match(RE_MQ_EXPRESSION),