Add support for activating and deactivating package-specific keymaps

src/package.coffee

@@ -200,7 +200,13 @@ class Package
 
   activateResources: ->
     @activationDisposables = new CompositeDisposable
-    @activationDisposables.add(atom.keymaps.add(keymapPath, map)) for [keymapPath, map] in @keymaps
+
+    @activationDisposables.add atom.config.observe "core.disabledKeymaps", {}, (map) =>
+      value = not _.include(map ? [], @name)
+      if value
+        @activateKeymaps()
+      else if not value
+        @deactivateKeymaps()
 
     for [menuPath, map] in @menus when map['context-menu']?
       try
@@ -232,6 +238,31 @@ class Package
     settings.activate() for settings in @settings
     @settingsActivated = true
 
+  activateKeymaps: ->
+    return if @keymapActivated
+
+    @keymapDisposables = new CompositeDisposable()
+
+    @keymapDisposables.add(atom.keymaps.add(keymapPath, map)) for [keymapPath, map] in @keymaps
+    atom.menu.update()
+
+    @keymapActivated = true
+
+  deactivateKeymaps: ->
+    return if not @keymapActivated
+
+    @keymapDisposables?.dispose()
+    atom.menu.update()
+
+    @keymapActivated = false
+
+  hasKeymaps: ->
+    for [path, map] in @keymaps
+      if map.length > 0
+        return true
+        
+    false
+
   activateServices: ->
     for name, {versions} of @metadata.providedServices
       servicesByVersion = {}
@@ -399,6 +430,7 @@ class Package
     settings.deactivate() for settings in @settings
     @stylesheetDisposables?.dispose()
     @activationDisposables?.dispose()
+    @keymapDisposables?.dispose()
     @stylesheetsActivated = false
     @grammarsActivated = false
     @settingsActivated = false