New Added client-side Sentry logging

Using Raven.js allows logging client-side javascript errors to the
configured Sentry server.

htdocs/includes/raven-js/plugins/console.js

@@ -0,0 +1,43 @@
+/**
+ * console plugin
+ *
+ * Monkey patches console.* calls into Sentry messages with
+ * their appropriate log levels. (Experimental)
+ */
+;(function(window, Raven, console) {
+'use strict';
+
+var originalConsole = console,
+    logLevels = ['debug', 'info', 'warn', 'error'],
+    level = logLevels.pop();
+
+var logForGivenLevel = function(level) {
+    var originalConsoleLevel = console[level];
+
+    // warning level is the only level that doesn't map up
+    // correctly with what Sentry expects.
+    if (level === 'warn') level = 'warning';
+    return function () {
+        var args = [].slice.call(arguments);
+        Raven.captureMessage('' + args, {level: level, logger: 'console'});
+
+        // this fails for some browsers. :(
+        if (originalConsoleLevel) {
+            // IE9 doesn't allow calling apply on console functions directly
+            // See: https://stackoverflow.com/questions/5472938/does-ie9-support-console-log-and-is-it-a-real-function#answer-5473193
+             Function.prototype.bind
+                 .call(originalConsoleLevel, originalConsole)
+                 .apply(originalConsole, args);
+        }
+    };
+};
+
+
+while(level) {
+    console[level] = logForGivenLevel(level);
+    level = logLevels.pop();
+}
+// export
+window.console = console;
+
+}(window, window.Raven, window.console || {}));