Fix use of deprecation `activationEvents`
Fix use of deprecation `activationEvents`

`activationEvents` has been replaced by `activationCommands` which are
scoped to either an `atom-workspace` selector or an `atom-text-editor`
selector. Since all the commands are contained within the editor
selector in the keymap, let's also keep them in the editor selector for
activation as well.

fotanus/rails-navigation,strikingcode/rails-navigation,strikingcode/rails-navigation,strikingcode/rails-navigation,fotanus/rails-navigation,fotanus/rails-navigation