Updated Wiki: Running Leak Detection

Here are the instructions for running leak detection as part of each release:

1. Download Visual Leak Detector: https://vld.codeplex.com/releases
2. Copy the vld.lib and dlls to your binary output directory.
3. Build the product and tests using the msbuild property 'CASA_ENABLE_VLD':

msbuild /p:CASA_ENABLE_VLD=true

4. Run each of the tests dlls individually or by specifying test.dll to the TestRunner.
5. A summary of any discovered leaks will be presented at the end of execution including the call stack that performed the allocation.