Merge pull request #293 from pozorvlak/rake_dependency

Make "rake" depend on "rake db:test:prepare".

lib/tasks/testing.rake

@@ -2,7 +2,7 @@ require 'rake'
 begin
   require 'rspec/core/rake_task'
   task(:spec).clear
-  RSpec::Core::RakeTask.new(:spec) do |t|
+  RSpec::Core::RakeTask.new(:spec => 'db:test:prepare') do |t|
     t.verbose = false
   end
 rescue LoadError