Added GH markdown for syntax highlighting in README

Looks a little better reading the small code snippets in the README with syntax highlighting.
Add srgb framebuffer attr
Merge pull request #225 from ExPixel/patch-1

Added GH markdown for syntax highlighting in README
Merge pull request #226 from jameson-ernst/master

Add srgb framebuffer attr
Demos build again. Fixes #224
Expose the underlying SDL2 OpenGL profile enumeration values.
Merge pull request #228 from caryhaynie/add_gl_profile_enum

Expose the underlying SDL2 OpenGL profile enumeration values.
Use "let ref" with raw pointers and derive Copy when required

This is the minimal set of changes that is needed to compile this
project with the latest nightly. Many more structs will probably also
want Copy (as shown by the warnings), but I'll leave that for other
people to decide.
Merge pull request #229 from Gekkio/let-ref-and-copy

Use "let ref" with raw pointers and derive Copy when required
Bumped version number
Derive or ignore Copy for types that can implement it
Merge pull request #230 from jameson-ernst/master

Derive or ignore Copy for types that can implement it
Bumped version number
Replace proc() with move ||
Don't derive Copy for bitflags

The bitflags! macro now includes #[deriving(Copy)] by default.
Merge pull request #231 from Gekkio/latest-nightly-2014-12-15

Fix compilation with latest nightly (2014-12-15)
Bumped version number
Remove shadowed lifetime
Make JoystickGUID data pub
Fix shadowed lifetime in Timer
Use already present lifetime