Added Lots of Documentation

Added some nice to haves
Improved and Unified General Code Layout

MathKit/MPParsedExpression.m

@@ -9,13 +9,15 @@
 #import "MPParsedExpression.h"
 
 #import "MPToken.h"
-
 #import "MPTerm.h"
 
+
 NSString *const MPMathKitErrorDomain = @"MPMathKitErrorDomain";
 NSString *const MPPathToExpressionKey = @"MPPathToExpressionKey";
 NSString *const MPErrorRangeKey = @"MPErrorRangeKey";
 
+
+
 @implementation MPParsedExpression
 
 - (NSDecimalNumber *)evaluate:(NSError *__autoreleasing *)error