Version 0.5

[kvark]

GFX v0.5
Closes #737

Device GL: https://github.com/gfx-rs/gfx_device_gl/pull/36
Window GLFW: https://github.com/gfx-rs/gfx_window_glfw/pull/5
Window Glutin: https://github.com/gfx-rs/gfx_window_glutin/pull/10
Examples: https://github.com/gfx-rs/gfx_examples/pull/25

List of changes:

• Graphics and Canvas are removed. Use Stream and its variations instead. Unfortunately, present() triggers an ICE but this will hopefully get addressed soon by Rust.
• you can create GL factories with device.spawn_factory(), which should be highly useful for libraries managing their own resources
• gfx_parameters! doesn't need you to set the link name manually any more
• IndexBuffer is removed. Buffer creation API is refactored.
• Renderer::draw* helpers are removed, only the fully functional draw() is there now. The helpers are in still the Stream interface, however.
• link_program_source doesn't have the capabilities parameter, each Factory now knows about its capabilities
• index slices are easier to create now via &[T].to_slice(&mut Factory, PrimitiveType) helper

[ghost]

Travis seems to not want to download things today :(

[ghost]

lgtm. I want travis to be green before I will merge it.

[kvark]

@csherratt travis is green