Fix tzinfo error on windows

Fixes the following error on Windows

```
C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/data_source.rb:182:in `rescue in create_default_data_source': No source of timezone data could be found. (TZInfo::DataSourceNotFound)
Please refer to http://tzinfo.github.io/datasourcenotfound for help resolving this error.
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/data_source.rb:179:in `create_default_data_source'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/data_source.rb:40:in `block in get'
        from <internal:prelude>:10:in `synchronize'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/data_source.rb:39:in `get'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/timezone.rb:629:in `data_source'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/timezone.rb:92:in `get'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/timezone_proxy.rb:67:in `real_timezone'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/timezone_proxy.rb:30:in `period_for_utc'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/tzinfo-1.2.1/lib/tzinfo/timezone.rb:549:in `current_period'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/core_ext/object/try.rb:45:in `public_send'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/core_ext/object/try.rb:45:in `try'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/values/time_zone.rb:223:in `utc_offset'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/values/time_zone.rb:396:in `block in []'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/values/time_zone.rb:396:in `tap'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/values/time_zone.rb:396:in `[]'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/core_ext/time/zones.rb:60:in `find_zone!'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-4.1.1/lib/active_support/railtie.rb:20:in `block in <class:Railtie>'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-4.1.1/lib/rails/initializable.rb:30:in `instance_exec'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-4.1.1/lib/rails/initializable.rb:30:in `run'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-4.1.1/lib/rails/initializable.rb:55:in `block in run_initializers'
        from C:/Ruby193/lib/ruby/1.9.1/tsort.rb:150:in `block in tsort_each'
        from C:/Ruby193/lib/ruby/1.9.1/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
        from C:/Ruby193/lib/ruby/1.9.1/tsort.rb:219:in `each_strongly_connected_component_from'
        from C:/Ruby193/lib/ruby/1.9.1/tsort.rb:182:in `block in each_strongly_connected_component'
        from C:/Ruby193/lib/ruby/1.9.1/tsort.rb:180:in `each'
        from C:/Ruby193/lib/ruby/1.9.1/tsort.rb:180:in `each_strongly_connected_component'
        from C:/Ruby193/lib/ruby/1.9.1/tsort.rb:148:in `tsort_each'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-4.1.1/lib/rails/initializable.rb:54:in `run_initializers'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-4.1.1/lib/rails/application.rb:288:in `initialize!'
        from C:/Users/amcoder/Projects/fresh2/config/environment.rb:5:in `<top (required)>'
        from C:/Users/amcoder/Projects/fresh2/config.ru:3:in `require'
        from C:/Users/amcoder/Projects/fresh2/config.ru:3:in `block in <main>'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
        from C:/Users/amcoder/Projects/fresh2/config.ru:in `new'
        from C:/Users/amcoder/Projects/fresh2/config.ru:in `<main>'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:49:in `eval'
```