Deprecate matchers for 2.0 release.

* Deprecates matchers from issue thoughtbot#252:
* assign_to
* respond_with_content_type
* query_the_database
* validate_format_of
* have_sent_email
* strong_parameters_matcher
* delegate_method

lib/shoulda/matchers/action_controller/assign_to_matcher.rb

@@ -1,3 +1,5 @@
+require 'active_support/deprecation'
+
 module Shoulda # :nodoc:
   module Matchers
     module ActionController # :nodoc:
@@ -22,6 +24,7 @@ class AssignToMatcher # :nodoc:
         attr_reader :failure_message_for_should, :failure_message_for_should_not
 
         def initialize(variable)
+          ActiveSupport::Deprecation.warn 'The assign_to matcher is deprecated and will be removed in 2.0'
           @variable    = variable.to_s
           @options = {}
           @options[:check_value] = false

lib/shoulda/matchers/action_controller/respond_with_content_type_matcher.rb

@@ -1,3 +1,5 @@
+require 'active_support/deprecation'
+
 module Shoulda # :nodoc:
   module Matchers
     module ActionController # :nodoc:
@@ -23,6 +25,7 @@ def respond_with_content_type(content_type)
 
       class RespondWithContentTypeMatcher # :nodoc:
         def initialize(content_type)
+          ActiveSupport::Deprecation.warn 'The respond_with_content_type matcher is deprecated and will be removed in 2.0'
           @content_type = look_up_content_type(content_type)
         end
 

lib/shoulda/matchers/action_controller/strong_parameters_matcher.rb

@@ -1,4 +1,5 @@
 require 'bourne'
+require 'active_support/deprecation'
 begin
   require 'strong_parameters'
 rescue LoadError
@@ -14,6 +15,7 @@ def permit(*attributes)
 
       class StrongParametersMatcher
         def initialize(*attributes_and_context)
+          ActiveSupport::Deprecation.warn 'The strong_parameters matcher is deprecated and will be removed in 2.0'
           @attributes = attributes_and_context[0...-1]
           @context = attributes_and_context.last
           @permitted_params = []

lib/shoulda/matchers/action_mailer/have_sent_email_matcher.rb

@@ -1,3 +1,5 @@
+require 'active_support/deprecation'
+
 module Shoulda # :nodoc:
   module Matchers
     module ActionMailer # :nodoc:
@@ -24,6 +26,7 @@ def have_sent_email
       class HaveSentEmailMatcher # :nodoc:
 
         def initialize(context)
+          ActiveSupport::Deprecation.warn 'The have_sent_email matcher is deprecated and will be removed in 2.0'
           @context = context
         end
 

lib/shoulda/matchers/active_model/validate_format_of_matcher.rb

@@ -1,3 +1,5 @@
+require 'active_support/deprecation'
+
 module Shoulda # :nodoc:
   module Matchers
     module ActiveModel # :nodoc:
@@ -27,6 +29,7 @@ def validate_format_of(attr)
 
       class ValidateFormatOfMatcher < ValidationMatcher # :nodoc:
         def initialize(attribute)
+          ActiveSupport::Deprecation.warn 'The validate_format_of matcher is deprecated and will be removed in 2.0'
           super
           @options = {}
         end

lib/shoulda/matchers/active_record/query_the_database_matcher.rb

@@ -1,3 +1,5 @@
+require 'active_support/deprecation'
+
 module Shoulda # :nodoc:
   module Matchers
     module ActiveRecord # :nodoc:
@@ -20,6 +22,7 @@ def query_the_database(times = nil)
 
       class QueryTheDatabaseMatcher # :nodoc:
         def initialize(times)
+          ActiveSupport::Deprecation.warn 'The query_the_database matcher is deprecated and will be removed in 2.0'
           @queries = []
           @options = {}
 

lib/shoulda/matchers/independent/delegate_matcher.rb

@@ -1,4 +1,5 @@
 require 'bourne'
+require 'active_support/deprecation'
 
 module Shoulda # :nodoc:
   module Matchers
@@ -26,6 +27,7 @@ def delegate_method(delegating_method)
 
       class DelegateMatcher
         def initialize(delegating_method)
+          ActiveSupport::Deprecation.warn 'The delegate_method matcher is deprecated and will be removed in 2.0'
           @delegating_method = delegating_method
         end