Patch - Renaming of unsigned int members. Fix return type for GetUInt64. Validation functions. about rapidjson HOT 5 CLOSED

Uploaded the wrong patch file.

The incorrect return type defeat has created an independent issue 48.
Renaming is not accepted.
Other API addition is considered as enhancement.

I see two more potential issues:
1) The code for the GetUint64() member function still uses kInt64Flag instead 
of kUint64Flag

2) The code for SetInt() member function on the "else if (IsUint64())" 
statement uses data_.n.i64 instead of data_.n.u64

Thank you. These two issues was also added to issue 48 and fixed by revision 
r89.