Pass a name string to RootView.activatePackage & deactivatePackage

Previously we were relying on the package module itself to have a
`name` field. But now that we're using `atom.loadPackage` to load up
packages, we can infer the name of the module from the name of the
package directory.

src/app/atom-package.coffee

@@ -18,7 +18,7 @@ class AtomPackage extends Package
       @loadMetadata()
       @loadKeymaps()
       @loadStylesheets()
-      rootView.activatePackage(@module) if @module
+      rootView.activatePackage(@name, @module) if @module
     catch e
       console.error "Failed to load package named '#{@name}'", e.stack
 

src/app/root-view.coffee

@@ -112,18 +112,17 @@ class RootView extends View
       when 'PaneColumn' then PaneColumn.deserialize(viewState, this)
       when 'Editor' then Editor.deserialize(viewState, this)
 
-  activatePackage: (packageModule) ->
-    throw new Error("Trying to activate a package module with no name attribute") unless packageModule.name?
-    @packageModules[packageModule.name] = packageModule
-    packageModule.activate(this, @packageStates[packageModule.name])
+  activatePackage: (name, packageModule) ->
+    @packageModules[name] = packageModule
+    packageModule.activate(this, @packageStates[name])
 
-  deactivatePackage: (packageModule) ->
-    packageModule.deactivate?()
-    delete @packageModules[packageModule.name]
+  deactivatePackage: (name) ->
+    @packageModules[name].deactivate?()
+    delete @packageModules[name]
 
   deactivate: ->
     atom.setRootViewStateForPath(@project.getPath(), @serialize())
-    @deactivatePackage(packageModule) for name, packageModule of @packageModules
+    @deactivatePackage(name) for name of @packageModules
     @remove()
 
   open: (path, options = {}) ->