Move logging to console when debug is enabled into separate function

Author: TvoroG

src/raven.js

@@ -681,9 +681,7 @@ function makeRequest(data) {
 function isSetup() {
     if (!hasJSON) return false;  // needs JSON support
     if (!globalServer) {
-        if (window.console && console.error && Raven.debug) {
-            console.error("Error: Raven has not been configured.");
-        }
+        logDebug('error', 'Error: Raven has not been configured.');
         return false;
     }
     return true;
@@ -720,6 +718,12 @@ function uuid4() {
     });
 }
 
+function logDebug(level, message) {
+    if (window.console && console[level] && Raven.debug) {
+        console[level](message);
+    }
+}
+
 function afterLoad() {
     // Attempt to initialize Raven on load
     var RavenConfig = window.RavenConfig;