Merge pull request #5 from kvark/master

HDR Image support
Rust upgrade.
Fix build error.
Update for language changes
Revert "Update for language changes". Reverted a bunch of HDR stuff.

This reverts commit 1c1f32b7c36247682483b74dcd56b0584694741c.
Fix force-depth
Update for language changes
Language changes.
Language changes.
Update to Rust 0.6 syntax.
Merge pull request #6 from metajack/rust-0.6-syntax

Update to Rust 0.6 syntax.
Add license
Add license headers
Remove modes.
Fix mutable FFI arguments.
Merge pull request #7 from metajack/no-modes

No modes
Language changes with extern modules
Fixed linker error with stbi symbols
Merge pull request #9 from Jeaye/master

Language changes with extern modules
Update for language changes