Added Lots of Documentation

Added some nice to haves
Improved and Unified General Code Layout

MathKit/MPToken.h

@@ -9,6 +9,8 @@
 
 /*!
  @header
+ This file contains the <code>MPToken</code> class and protocol.
+ 
  One way to represent a mathematical expression using the <code>@link
  MPExpression@/link</code> class is a sequence of tokens. A token is a logical
  unit of input. The different types of units are identified by a @link
@@ -30,10 +32,6 @@ while ((token = [self nextToken]).tokenType != MPEOFToken) {
  */
 
 
-@class MPToken;
-@protocol MPToken;
-
-
 /*!
     @typedef    MPTokenType
     @abstract   The type of a token identifies its behaviour in a mathematical
@@ -103,6 +101,10 @@ typedef enum {
 
 
 
+@class MPToken;
+@protocol MPToken;
+
+
 /*!
     @protocol   MPToken
     @abstract   Tokens represent logical units in an expresion.