Merge pull request #121 from juliandescottes/enhance-gif-encoding-with-gif.js

Enhance gif encoding with gif.js
Merge pull request #117 from juliandescottes/minify-statics

Added concat and uglify tasks to grunt.
Merge pull request #125 from juliandescottes/propose-use-iframe-cheap-templates

Propose use iframe cheap templates
Merge branch 'master' into feature-gif-export-panel