Describe how to integrate upstream changes
CMS7-7986: remove codemirror plugin c5a7b8036b5c7beafea73104739a42c2b5c83fd3
CMS7-7986: add codemirror plugin 733397f3cbf43a0f00567f5df5f48a8568c949ef
CMS7-7986: remove wordcount plugin d903b95b24a6ee699b39b06d99b87b4f5dbc6508
CMS7-7986: add wordcount plugin v1.09
CMS7-7986: remove youtube plugin a2cacde89cd482b830400dd3b7150f25ac6278f7
CMS7-7986: add youtube plugin 1212fb39eac44b2e229a570cd11f69aed351d938