Merge branch 'master' into state-and-lifecycle

Author: deblasis

GLOSSARY.md

@@ -45,3 +45,4 @@ If you encounter one of those expressions for the first time, it might be worth
 - `refactor` ([#9](https://github.com/reactjs/it.reactjs.org/issues/9))
 - `event handler` ([#10](https://github.com/reactjs/it.reactjs.org/issues/10))
 - `event listener` ([#10](https://github.com/reactjs/it.reactjs.org/issues/10))
+- `mount` and `unmount` in sentences ([#108](https://github.com/reactjs/it.reactjs.org/issues/108))