Re-export crates from renderers

CHANGELOG.markdown

@@ -8,6 +8,8 @@
 - Redesigned progress bar API
 - Redesigned color editor/picker API
 - Renderer errors implement std::error::Error
+- Glium renderer re-exports imgui and glium
+- Gfx renderer re-exports imgui and gfx
 
 ### Removed
 

imgui-gfx-renderer/src/lib.rs

@@ -1,3 +1,6 @@
+pub extern crate gfx;
+pub extern crate imgui;
+
 use gfx::format::BlendFormat;
 use gfx::handle::{Buffer, RenderTargetView};
 use gfx::memory::Bind;

imgui-glium-renderer/src/lib.rs

@@ -1,3 +1,6 @@
+pub extern crate glium;
+pub extern crate imgui;
+
 use glium::backend::{Context, Facade};
 use glium::index::{self, PrimitiveType};
 use glium::program::ProgramChooserCreationError;