Update angular to 1.2.20
add pixi.js v1.6.1
Merge pull request #3596 from mitchogaard/master

Update angular to 1.2.20
add angular.js v1.2.19
add i18n files for angular.js v1.2.10
add i18n files for angular.js v1.2.11
add i18n files for angular.js v1.2.12
add i18n files for angular.js v1.2.13
add i18n files for angular.js v1.2.14
add i18n files for angular.js v1.2.15
add i18n files for angular.js v1.2.16
add i18n files for angular.js v1.2.18
add i18n files for angular.js v1.2.20
git add angular.js v1.2.17