Allow activesupport gems higher than 3.0.0

cocaine.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency('bourne')
   s.add_development_dependency('mocha')
   s.add_development_dependency('rake')
-  s.add_development_dependency('active_support')
+  s.add_development_dependency('activesupport', ">= 3.0.0", "< 5.0")
   s.add_development_dependency('pry')
 end
 

spec/cocaine/command_line_spec.rb

@@ -211,7 +211,7 @@
 
   it 'can still take something that does not respond to tty as a logger' do
     output_buffer = StringIO.new
-    logger = ActiveSupport::BufferedLogger.new(output_buffer)
+    logger = best_logger.new(output_buffer)
     logger.should_not respond_to(:tty?)
     Cocaine::CommandLine.new("echo", "'Logging!' :foo", :logger => logger).run(:foo => "bar")
     output_buffer.rewind

spec/spec_helper.rb

@@ -16,3 +16,13 @@
   config.include StubOS
   config.include UnsettingExitstatus
 end
+
+def best_logger
+  if ActiveSupport.const_defined?("Logger")
+    ActiveSupport::Logger
+  elsif ActiveSupport.const_defined?("BufferedLogger")
+    ActiveSupport::BufferedLogger
+  else
+    Logger
+  end
+end