Added Lots of Documentation

Added some nice to haves
Improved and Unified General Code Layout

MathKit/MPVariable.h

@@ -9,14 +9,44 @@
 #import "MPTerm.h"
 
 
+/*!
+ @header
+ This file contains the <code>MPVariable</code> class.
+ */
+
+
 
 @class MPVariable;
 
 
+/*!
+    @class      MPVariable
+    @abstract   This class represents a variable.
+ 
+    @discussion Variables are evaluated in the <code>@link
+                //apple_ref/occ/cl/MPEvaluationContext@/link</code> and generate
+                errors if they are not defined.
+ */
 @interface MPVariable : MPTerm
 
+/*!
+    @method     initWithVariableName:
+    @abstract   Initializes a <code>MPVariable</code> with the specified
+                <code>variableName</code>
+
+    @param      variableName
+                The name of the variable. Must not be <code>nil</code> and must
+                be at least one character long.
+ 
+    @return     A new <code>MPVariable</code> instance.
+ */
 - (instancetype)initWithVariableName:(NSString *)variableName; /* designated initializer */
 
+
+/*!
+    @property   variableName
+    @abstract   The receiver's variable name.
+ */
 @property (readonly, nonatomic, strong) NSString *variableName;
 
 @end