fix some indent in readme

README.markdown

@@ -21,7 +21,7 @@ layer type is supported.
 File layer is the basic one.
 
 ```go
-    l := onion.NewFileLayer("/path/to/the/file.ext")
+l := onion.NewFileLayer("/path/to/the/file.ext")
 ```
 
 the onion package only support for json extension by itself, and there is toml
@@ -36,18 +36,18 @@ and call the RegisterLoader function with your loader object
 Folder layer is much like file layer but it get a folder and search for the
 first file with tha specific name and supported extension
 ```go
-    l := onion.NewFolderLayer("/path/to/folder", "filename")
+l := onion.NewFolderLayer("/path/to/folder", "filename")
 ```
 the file name part is WHITOUT extension. library check for supported loader
 extension in that folder and return the first one.
 
 
-### ENV Loader
+### ENV layer
 
-The other layer is env layer. this layer accept a whitelist of env variables and
-use them as value .
+The other layer is env layer. this layer accept a white list of env variables and
+use them as key for the env variables.
 ```go
-    l := onion.NewEnvLayer("PORT", "STATIC_ROOT", "NEXT")
+l := onion.NewEnvLayer("PORT", "STATIC_ROOT", "NEXT")
 ```
 this layer currently dose not support nested variables.
 
@@ -56,32 +56,32 @@ this layer currently dose not support nested variables.
 
 After adding layers to config, its easy to get the config values.
 ```go
-    o := onion.New()
-    o.AddLayer(l1)
-    o.AddLayer(l2)
+o := onion.New()
+o.AddLayer(l1)
+o.AddLayer(l2)
 
-    o.GetString("key", "default")
-    o.GetBool("anotherkey", true)
+o.GetString("key", "default")
+o.GetBool("anotherkey", true)
 
-    o.GetInt("worker.count", 10) // Nested value
+o.GetInt("worker.count", 10) // Nested value
 ```
 library also support for mapping data to a structure. define your structure :
 ```go
-    type MyStruct struct {
-        Key1 string
-        Key2 int
+type MyStruct struct {
+    Key1 string
+    Key2 int
 
-        Key3 bool `onion:"boolkey"`  // struct tag is supported to change the name
+    Key3 bool `onion:"boolkey"`  // struct tag is supported to change the name
 
-        Other struct {
-            Nested string
-        }
+    Other struct {
+        Nested string
     }
+}
 
-    o := onion.New()
-    // Add layers.....
-    c := MyStruct{}
-    o.GetStruct("prefix", &c)
+o := onion.New()
+// Add layers.....
+c := MyStruct{}
+o.GetStruct("prefix", &c)
 ```
 the the c.Key1 is equal to o.GetString("prefix.key1", c.Key1) , note that the
 value before calling this function is used as default value, when the type is