Prevent manifest task definition from being loaded in dependent projects

The manifist task is only for publify_core. Dependent gems should handle
manifests by themselves and not be required to have rake-manifest
installed as a development dependency.

Author: mvz

Manifest.txt

@@ -459,7 +459,6 @@ lib/publify_time.rb
 lib/sidebar_field.rb
 lib/sidebar_registry.rb
 lib/spam_protection.rb
-lib/tasks/manifest.rake
 lib/tasks/publify_core_tasks.rake
 lib/text_filter_plugin.rb
 lib/theme.rb

Rakefile

@@ -16,10 +16,15 @@ load "rails/tasks/statistics.rake"
 Bundler::GemHelper.install_tasks
 
 require "rspec/core/rake_task"
+require "rake/manifest/task"
+
+Rake::Manifest::Task.new do |t|
+  t.patterns = ["*.md", "MIT-LICENSE", "{app,config,db,lib,themes}/**/*"]
+end
+
+task default: "manifest:check"
 
 desc "Run all specs in spec directory"
 RSpec::Core::RakeTask.new(spec: "app:db:test:prepare")
-task default: :spec
 
-load "lib/tasks/manifest.rake"
-task default: "manifest:check"
+task default: :spec