Fix some issues with the new `watchos` platform.

lib/cocoapods/generator/copy_resources_script.rb

@@ -51,6 +51,7 @@ module Pod
       EXTERNAL_STRINGS_FILE_MIMINUM_DEPLOYMENT_TARGET = {
         :ios => Version.new('6.0'),
         :osx => Version.new('10.8'),
+        :watchos => Version.new('2.0')
       }
 
       # @return [Bool] Whether the external strings file is supported by the

lib/cocoapods/generator/header.rb

@@ -82,7 +82,7 @@ module Pod
       # @return [String]
       #
       def generate_platform_import_header
-        "#import #{platform == :ios ? '<UIKit/UIKit.h>' : '<Cocoa/Cocoa.h>'}\n"
+        "#import <Foundation/Foundation.h>\n"
       end
     end
   end

lib/cocoapods/installer/target_installer/pod_target_installer.rb

@@ -186,6 +186,7 @@ module Pod
       ENABLE_OBJECT_USE_OBJC_FROM = {
         :ios => Version.new('6'),
         :osx => Version.new('10.8'),
+        :watchos => Version.new('2.0')
       }
 
       # Returns the compiler flags for the source files of the given specification.