Now support for config files as yaml, json or toml

docs/content/doc/configuration.md

@@ -7,15 +7,50 @@ The directory structure and templates provide the majority of the
 configuration for a site. In fact a config file isn't even needed for many websites
 since the defaults used follow commonly used patterns.
 
-The following is an example of a config file with the default values: 
+Hugo expects to find the config file in the root of the source directory and
+will look there first for a config.yaml file. If none is present it will
+then look for a config.json file, followed by a config.toml file.
 
-    SourceDir: "content"
-    LayoutDir: "layouts"
-    PublishDir: "public"
-    BuildDrafts: false
-    Tags:
+**Please note the field names must be all lowercase**
+
+## Examples
+
+The following is an example of a yaml config file with the default values: 
+    ---
+    sourcedir: "content"
+    layoutdir: "layouts"
+    publishdir: "public"
+    builddrafts: false
+    indexes:
        category: "categories"
        tag: "tags"
-    BaseUrl: "http://yourSite.com/"
+    baseurl: "http://yoursite.com/"
     ...
 
+
+The following is an example of a json config file with the default values: 
+    {
+        "sourcedir": "content",
+        "layoutdir": "layouts",
+        "publishdir": "public",
+        "builddrafts": false,
+        "indexes": {
+           category: "categories",
+           tag: "tags"
+        },
+        "baseurl": "http://yoursite.com/"
+    }
+
+
+The following is an example of a toml config file with the default values: 
+
+    sourcedir = "content"
+    layoutdir = "layouts"
+    publishdir = "public"
+    builddrafts = false
+    baseurl = "http://yoursite.com/"
+    [indexes]
+       category = "categories"
+       tag = "tags"
+
+