Conflict on function appendUTF8String on NSMutableData extension

[felairtonh]

In my company, we have a project that uses MASFoundation combined with some analytics libraries. One of these libraries, Dynatrace, have a conflict in the mentioned function. This conflict cause an invalidation on the CSR generation, because the implementation on the Dynatrace's library don't append the bytes for type and size of the contents and the obtained result have two bites less than necessary. My suggestion is change the declaration of the function to avoid this conflicts.