Fixed "undefined method `block_size'" issue.

With Chef 10.X and 11.X I was receiving the following exception:

    Generated at 2013-02-16 00:11:07 +0000
    NoMethodError: swap_file[/swapfile] (RECIPENAME::COOKBOOKNAME line 3) had an error: NoMethodError: undefined method `block_size' for Chef::Resource::Bash
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource.rb:279:in `method_missing'
    /root/chef/cookbooks/swap/providers/file.rb:24:in `block (2 levels) in class_from_file'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/dsl/recipe.rb:71:in `instance_eval'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/dsl/recipe.rb:71:in `method_missing'
    /root/chef/cookbooks/swap/providers/file.rb:23:in `block in class_from_file'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/provider/lwrp_base.rb:138:in `instance_eval'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/provider/lwrp_base.rb:138:in `block in action'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/provider.rb:118:in `run_action'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource.rb:603:in `run_action'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/runner.rb:50:in `run_action'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/runner.rb:82:in `block (2 levels) in converge'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/runner.rb:82:in `each'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/runner.rb:82:in `block in converge'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource_collection.rb:94:in `block in execute_each_resource'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource_collection/stepable_iterator.rb:116:in `call'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource_collection/stepable_iterator.rb:116:in `call_iterator_block'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource_collection/stepable_iterator.rb:85:in `step'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource_collection/stepable_iterator.rb:104:in `iterate'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource_collection/stepable_iterator.rb:55:in `each_with_index'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/resource_collection.rb:92:in `execute_each_resource'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/runner.rb:81:in `converge'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/client.rb:404:in `converge'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/client.rb:469:in `do_run'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/client.rb:200:in `run'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application.rb:190:in `run_chef_client'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application/solo.rb:239:in `block in run_application'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application/solo.rb:231:in `loop'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application/solo.rb:231:in `run_application'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/lib/chef/application.rb:73:in `run'
    /opt/chef/embedded/lib/ruby/gems/1.9.1/gems/chef-11.4.0/bin/chef-solo:25:in `<top (required)>'
    /usr/bin/chef-solo:23:in `load'
    /usr/bin/chef-solo:23:in `<main>'

This pull request makes block_size a variable rather than a method, and defines it above the resource calls.