title: Using postgres_ext with postgis adapter not working with array columns
body: <p>I've successfully installed PostGIS and using the <code>postgres_ext</code> gem to add support  Rails <code>postgis</code> ActiveRecord adapter, but when I try to use a Postgres array column type in my migration, it fails:</p>
  
  <pre><code>t.string :pets, :array =&gt; true, :limit =&gt; 12
  </code></pre>
  
  <p>And the error:</p>
  
  <pre><code>rake aborted!
  An error has occurred, this and all later migrations canceled:
  
      undefined method `array' for #&lt;ActiveRecord::ConnectionAdapters::ColumnDefinition:0x007fa8357b3308&gt;
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.9/lib/active_support/core_ext/object/try.rb:36:in `try'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/postgres_ext-0.0.9/lib/postgres_ext/active_record/connection_adapters/postgres_adapter.rb:197:in `add_column_options!'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/schema_definitions.rb:38:in `add_column_options!'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/schema_definitions.rb:31:in `to_sql'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-postgis-adapter-0.4.3/lib/active_record/connection_adapters/postgis_adapter/spatial_table_definition.rb:76:in `block in to_sql'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-postgis-adapter-0.4.3/lib/active_record/connection_adapters/postgis_adapter/spatial_table_definition.rb:76:in `map'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-postgis-adapter-0.4.3/lib/active_record/connection_adapters/postgis_adapter/spatial_table_definition.rb:76:in `to_sql'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-postgis-adapter-0.4.3/lib/active_record/connection_adapters/postgis_adapter/main_adapter.rb:192:in `create_table'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.9/lib/active_record/migration.rb:466:in `block in method_missing'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.9/lib/active_record/migration.rb:438:in `block in say_with_time'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.9/lib/active_record/migration.rb:438:in `say_with_time'
      /Users/avishai/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.9/lib/active_record/migration.rb:458:in `method_missing'
  </code></pre>
  
  <p>Gemfile:</p>
  
  <pre><code>gem "rails", "~&gt; 3.2.9"
  gem "airbrake"
  gem "pg"
  gem "postgres_ext"
  gem "activerecord-postgis-adapter"
  gem "activerecord-postgres-array", "~&gt; 0.0.8"
  </code></pre>
  
  <p>Any idea ideas how to fix this?</p>