Fix SDL double-load
Update the README and add some text formatting
Add missing std headers for compilation with VisualStudio 2013.

Additional C++11 support in VS12 requires inclusion of the proper headers.
Merge pull request #334 from Deledrius/vs_2013_std

Add missing std headers for compilation with VisualStudio 2013.
Merge pull request #333 from Mystler/readme

README update.

- Update Guild of Writers address.
- Enhance formatting in step-by-step instructions.
- Various other updates and typographical fixes.
Change README format to Markdown
Move the optional dependencies to a separete list
Remove November 2008 DirectX SDK from README
Merge pull request #335 from Mystler/readme

Port README to Markdown.
Fix CMake warnings on linking the Python libraries
Merge pull request #337 from Mystler/cmake-python

Fix CMake warnings for Python libraries.
Allow disabling certain parts of the build
Merge pull request #338 from Mystler/moar-cmake

Allow disabling supplemental projects with CMake
Cleanup macro-mayhem

This converts the VERTBLEND macros to some clever templates. This code
should be much more maintainable.
Fill volatile buffers

This shaves off a memcpy and some smaller copies. Decent gains that scale
up quite well as more avatars are on screen.
SSE 4.1 Skinning

This appears to offer no benefit on my Wolfdale CPU, but I expect it will
be useful on more recent ones.
Nuke some `snprintf`
Let's use `vsnprintf` for those legacy methods...
Begin killing off sprintf
Fix Console Help indentation