Added Lots of Documentation

Added some nice to haves
Improved and Unified General Code Layout

MathKit/MPExpression.m

@@ -21,11 +21,11 @@
 #import "NSIndexPath+MPAdditions.h"
 
 
-
 NSString *const MPIllegalElementException = @"Illegal Element Exception";
 NSString *const MPIllegalElementExceptionElementKey = @"MPIllegalElementExceptionElementKey";
 
 
+
 @interface MPExpression () {
     NSMutableArray * _elements;
 }
@@ -299,7 +299,6 @@ NSString *const MPIllegalElementExceptionElementKey = @"MPIllegalElementExceptio
 }
 
 
-#warning If multiple equal expressions exist errors may occur...
 - (NSUInteger)indexOfElement:(id<MPExpressionElement>)element
 {
     return [_elements indexOfObject:element];
@@ -656,7 +655,7 @@ NSString *const MPIllegalElementExceptionElementKey = @"MPIllegalElementExceptio
 
 - (NSString *)description
 {
-#warning Bad Implementation
+#warning Incomplete Implementation
     NSMutableString *description = [[NSMutableString alloc] init];
     NSUInteger index = 0;
     for (id element in _elements) {