User TimeZones

	#1 .ApplicationController
	class ApplicationController < ActionController::Base
	around_filter :set_time_zone
	def set_time_zone(&block)
	time_zone = current_user.shop.try(:timezone) || 'UTC'
	Time.use_zone(time_zone, &block)
	end
	end
	#2. Generate migration
	class AddTimezoneToShops < ActiveRecord::Migration
	def change
	add_column :shops, :timezone, :string, :default => 'Europe/Athens'
	end
	end
	#3. Set a form
	<div class="form-group">
	<%= f.label :timezone, :class => "col-lg-2 control-label" %>
	<div class="col-lg-10">
	<%= f.input :timezone, :collection => Timezone::Zone.names, :label => false ,:include_blank => false,
	:class => "form-control" %>
	</div>
	</div>

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