Some suggested fixes for compiling x64 version in Visual Studio 2013

[gunamoi1]

Hi all,
Not sure if this is an active project, but there do seem to have been some changes in the last year since I started using it for accessing QuickBooks Online.

Just downloaded the latest files, and there appears to be a new bug in urlencode.cpp, which can be fixed as follows:
change line 97
from: assert(false && 'Unknown urlencode type');
to: assert(false && "Unknown urlencode type");

Previously, when compiling this library into my applications with Visual Studio 2013, there were a number of warning messages, especially when compiling for x64 version.

Firstly, in both liboauthcpp.cpp, and SHA1.cpp, add the following line at top to avoid "strcpy possible unsafe" warnings:
#define _CRT_SECURE_NO_WARNINGS

The attached text file lists changes which have worked for me to stop warning messages when compiling x64. These mostly seem to relate to converting from size_t (which may be a 64 bit value) to an int (which may be only 32 bit value).

Anyway, submitted for consideration and possible inclusion in future versions.

regards,
Garry.

Mods in liboauthcpp to accomodate x64.txt