WIP: Better backend treatment
FIX: Fix logging test
WIP: Setting config
ENH: Add window options to Canvas
ENH: Context sharing
FIX: Read info from gl
ENH: Add SDL2
FIX: Fix SDL2
FIX: Set current
FIX: Minor fixes
FIX: Fix for GLUT
FIX: close_key
FIX: No default quit key
FIX: Make close key check a method
FIX: Typo
FIX: Fix SDL key reading
FIX: Build in close key check
FIX: Last example and Travis
Merge pull request #235 from Eric89GXL/unity

ENH: Better backend treatment