Change target_os to windows instead of win32
Add RenderTarget trait.

Updated RenderWindow and RenderTexture to use it,
and appropriate imports where needed.  Should probably
update the Drawable trait now, as that's where the most
benefit will show up.

This is a minorly breaking change as it needs an extra import
and possibly some changes where views for RenderWindows are needed.
Change Drawable to use the new RenderTarget trait.
Merge pull request #48 from sebcrozet/master

Add a constructor to load a `Font` from the memory.
Merge pull request #49 from brandonson/render-target-trait

RenderTarget trait
Update README.md
Fix examples in docs

Update examples to work with latest Rust/rsfml.
Use `rust` instead of `Rust` as language identifier, as
rustdoc only recognizes `rust` (at least on linux).
Merge pull request #50 from crumblingstatue/master

Fix examples in docs
remove warnings
add draw_primitive method to RenderTarget
fix travis
fix warnings from last Rust
mut_null is now null_mut
update to last Rust
- Vec::from_slice is now slice.to_vec()
update to last rust, invisible_private_type lint removed
Fixed typos and improved wording.
Update README.md
Merge pull request #52 from akunaatrium/master

Minor improvements to the readme.
update to last Rust
- move is now a keyword -> move_
update to last rust
- multiple #cfg semantics
- pop_byte deprecated
Update to the last rust.