fix specs ordering

Author: bogdan

Rakefile

@@ -28,12 +28,11 @@ Jeweler::RubygemsDotOrgTasks.new
 require 'rspec/core'
 require 'rspec/core/rake_task'
 RSpec::Core::RakeTask.new(:spec) do |spec|
-  spec.pattern = FileList['spec/**/*_spec.rb']
-end
-
-RSpec::Core::RakeTask.new(:rcov) do |spec|
-  spec.pattern = 'spec/**/*_spec.rb'
-  spec.rcov = true
+  spec.pattern =  FileList['spec/**/*_spec.rb'].sort_by do|n|
+    # we need to run post_rails_init_spec as the latest
+    # because it cause unrevertable changes to runtime
+    n.include?("post_rails_init_spec") ? 1 : 0
+  end
 end
 
 task :default => :spec