Added support for WinJS stack traces

Issue #14 (changes from raygun)

Author: niemyjski

tracekit.js

@@ -629,6 +629,7 @@ TraceKit.computeStackTrace = (function computeStackTraceWrapper() {
 
         var chrome = /^\s*at (?:((?:\[object object\])?\S+(?: \[as \S+\])?) )?\(?((?:file|http|https):.*?):(\d+)(?::(\d+))?\)?\s*$/i,
             gecko = /^\s*(\S*)(?:\((.*?)\))?@((?:file|http|https).*?):(\d+)(?::(\d+))?\s*$/i,
+            winjs = /^\s*at (?:((?:\[object object\])?.+) )?\(?((?:ms-appx|http|https):.*?):(\d+)(?::(\d+))?\)?\s*$/i,
             lines = ex.stack.split('\n'),
             stack = [],
             parts,
@@ -651,6 +652,13 @@ TraceKit.computeStackTrace = (function computeStackTraceWrapper() {
                     'line': +parts[3],
                     'column': parts[4] ? +parts[4] : null
                 };
+            } else if ((parts = winjs.exec(lines[i]))) {
+              element = {
+                'url': parts[2],
+                'func': parts[1] || UNKNOWN_FUNCTION,
+                'line': +parts[3],
+                'column': parts[4] ? +parts[4] : null
+              };
             } else {
                 continue;
             }