Fixed indentation/formatting issues

There were some issues with formatting where some lines used tabs and some spaces. Although not noticeable in Visual Studio, it's obvious in GitHub's interface (sorry, I'm very picky with this kind of things :P).

Done via Visual Studio autoformatting (CTRL+K, CTRL+D).

Feel free to ignore this PR or propose a different style, I just opted for VS2010 default auto-format.