reinstate rake tasks that are still needed

Rakefile

@@ -12,3 +12,28 @@ namespace :db do
     sh 'psql -q travis_test < spec/support/db/structure.sql'
   end
 end
+
+desc "generate gemspec"
+task 'travis-api.gemspec' do
+   content = File.read 'travis-api.gemspec'
+
+   fields = {
+     authors: `git shortlog -sn`.scan(/[^\d\s].*/),
+     email:   `git shortlog -sne`.scan(/[^<]+@[^>]+/),
+     files:   `git ls-files`.split("\n").reject { |f| f =~ /^(\.|Gemfile)/ }
+   }
+
+   fields.each do |field, values|
+     updated = "  s.#{field} = ["
+     updated << values.map { |v| "\n    %p" % v }.join(',')
+     updated << "\n  ]"
+     content.sub!(/  s\.#{field} = \[\n(    .*\n)*  \]/, updated)
+   end
+
+   File.open('travis-api.gemspec', 'w') { |f| f << content }
+ end
+
+ task default: 'travis-api.gemspec'
+
+ tasks_path = File.expand_path('../lib/tasks/*.rake', __FILE__)
+ Dir.glob(tasks_path).each { |r| import r }