Added Lots of Documentation

Added some nice to haves
Improved and Unified General Code Layout

MathKit/MPProductTerm.m

@@ -8,17 +8,7 @@
 
 #import "MPProductTerm.h"
 
-#import "MPParsedExpression.h"
-#import "MPPowerFunction.h"
 
-#import "MPFunctionTerm.h"
-#import "MPElementaryFunctionTerm.h"
-#import "MPNumber.h"
-#import "MPFactorialTerm.h"
-#import "MPPowerTerm.h"
-#import "MPVariable.h"
-
-#import "MPToken.h"
 
 @implementation MPProductTerm
 
@@ -33,6 +23,7 @@
     return self;
 }
 
+
 - (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
 {
     NSDecimalNumber *value = [NSDecimalNumber one];