title: spree install undefined method mass_assignment_sanitizer
body: <p>I took a look about this problem within the list of question but nothing helped.
  This is my first question in stackoverflow so please accept my apologies in case I do something wrong. Also I still have a lot of english to improve.</p>
  
  <p>I'm installing Spree following the github instructions</p>
  
  <pre><code>$ gem install spree
  $ rails new my_store
  $ spree install my_store
  </code></pre>
  
  <p>when I get this message</p>
  
  <p>...</p>
  
  <pre><code>Admin Password [spree123] 
  gemfile  spree
  gemfile  spree_usa_epay
  gemfile  spree_skrill
       run  bundle install from "./my_store"
  git://github.com/spree/spree_usa_epay.git (at 0cb57b4) is not checked out. Please run `bundle install`
  precompiling  assets
  git://github.com/spree/spree_usa_epay.git (at 0cb57b4) is not checked out. Please run `bundle install`
  </code></pre>
  
  <p>...
  Well, as the guide suggests, in case of circular dependency issues do:</p>
  
  <pre><code>$ gem install spree_cmd
  
  $spree install my_store -A
  
  gemfile  spree
  gemfile  spree_usa_epay
  gemfile  spree_skrill
       run  bundle install from "./my_store"
  git://github.com/spree/spree_usa_epay.git (at 0cb57b4) is not checked out. Please run `bundle install`
  precompiling  assets
  git://github.com/spree/spree_usa_epay.git (at 0cb57b4) is not checked out. Please run `bundle install`
  </code></pre>
  
  <p>I changed directory to the app and run the command:</p>
  
  <pre><code>$cd my_store
  
  $bundle install 
  </code></pre>
  
  <p>and I get the following error</p>
  
  <pre><code>Bundler could not find compatible versions for gem "rails":
  In Gemfile:
  spree_usa_epay (&gt;= 0) ruby depends on
    rails (&lt;= 3.1.3, &gt;= 3.1.1) ruby
  
  rails (3.2.1)
  </code></pre>
  
  <p>after this I changed the gem file to work with rails 3.1.3 and coffeescript gems and repeat the whole process again and I get this.</p>
  
  <pre><code>Users/Snake/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-  3.1.3/lib/active_record/base.rb:1088:in `method_missing': undefined method  `mass_assignment_sanitizer=' for ActiveRecord::Base:Class (NoMethodError)
  from /Users/Snake/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/railtie.rb:59:in `block (3 levels) in &lt;class:Railtie&gt;'
  </code></pre>
  
  <p>It think it might be something with version of rails a spree but I don't know were to start.</p>
  
  <p>Does anybody had this issue before?</p>
  
  <p>I running Mac OS X 10.5.8</p>
  
  <p>rails 3.2.1</p>
  
  <p>ruby 1.9.3p0 (2011-10-30 revision 33570) [i386-darwin9.8.0]</p>
  
  <p>ImageMagick @6.7.4-6_0+q16</p>