Update README.md
Merge branch 'glsl.io' with some fixes
Update README.md
Update README.md
Update README.md
Update README.md
TransitionCanvasCache progress positionning polish (allow progress=1)
Fix #77 – improve way feedback come in the Github

- Feedback link at the right
- The error page have a "Report this Bug" auto-filled issue link
- no more "Found a bug?" in the footer
Technical support of imgur URLs, no UI yet. Move textures to textures/luma/
Add autocompletion in GLSL editor :-)
Fix feedback z-index
Introduce GlslEditor onCursorTokenChange callback
Upgrade some packages + glsl-transition 0.6.x

+ use exact version number for everything except my own maintain packages
WIP of a contextual documentation
restyle GlslContextualHelp
Improve detecting the token when using selection
improve style of GlslContextualHelp
Add tabs in Editor
Bugfix that GlslContextualHelp sometimes don't have usage example
Bugfix that GlslContextualHelp sometimes don't have usage example