Updated Xcode project file to target C++11.
Coordinates of slides are now all ints.

Previously we used floats unnecessarily (this also fixes many static
casts requirements for C++11).
Now using vsnprintf() from C++11 to parse strings.
Removed Frameworks folder.
Removed Sample folder.
Removed Linux folder.
Updated headers of external libraries.
Updated libraries for Mac.
Updated build settings for Mac.

No longer linking against frameworks. Now targeting OS X 10.7 with
C++11 support.
Dagon now reports the version of all used libraries.