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Update to Visual Studio 2012 (diff)

Run tests using special script on Windows. Ensures that GCC DLLs are on the path, so that test executables will run. Also run debug tests as well as release tests.

Add logging to S3Client about connection reuse

Set network timeout in S3Client. To give the S3Simulator a chance to respond.

Improve exception messages in HTTPRequest as well

Disable httpserver keepalive tests until keepalive support is implemented. Switch httpserver daemon start/stop to use standard functions.

Use MinGW test runner to make compile script work

Add a MinGW test runner to version control.

Add more generated files to svn:ignore.

Fix warnings when compiling with MinGW64 headers. These headers define things that aren't defined by MinGW32 or MSVC, so make the definitions in emu.h conditional (feature detection).