Modified the SassAndCoffeeRuntime so that it creates a new IEJavaScriptRuntime and disposes of it right after execute
This gets around the COM exceptions. Looks like running multiple exceutions against the same runtime isn't working so well.
Later on we can look at sharing at least the files for a single request as soon as we have some lifetime management in here
Issue #60
Merge pull request #61 from nathanpalmer/com-exceptions

Modified the SassAndCoffeeRuntime so that it creates a new IEJavaScriptR...