add appraisal for testing against multiple versions of activerecord

Signed-off-by: t.pickett66 <t.pickett66@gmail.com>

Gemfile.lock

@@ -26,6 +26,9 @@ GEM
       i18n (~> 0.6)
       multi_json (~> 1.0)
     addressable (2.3.2)
+    appraisal (0.4.1)
+      bundler
+      rake
     arel (3.0.2)
     builder (3.0.3)
     capybara (1.1.2)
@@ -87,6 +90,7 @@ PLATFORMS
 
 DEPENDENCIES
   activeresource (>= 2.3.12, < 4.0)
+  appraisal (~> 0.4.1)
   capybara (= 1.1.2)
   net-ldap (~> 0.1.1)
   rack-test

Rakefile

@@ -1,2 +1,3 @@
+require 'appraisal'
 Dir['tasks/**/*.rake'].each { |rake| load rake }
 task :default => :spec

rubycas-server.gemspec

@@ -41,6 +41,7 @@ For more information on RubyCAS-Server, see http://code.google.com/p/rubycas-ser
   s.add_development_dependency("rspec-core")
   s.add_development_dependency("rake", "0.8.7")
   s.add_development_dependency("sqlite3", "~> 1.3.1")
+  s.add_development_dependency("appraisal", "~> 0.4.1")
 
   # for authenticator specs
   s.add_development_dependency("net-ldap", "~> 0.1.1")