normalize article and category attributes (closes foodcoops#294)

app/models/article.rb

@@ -45,6 +45,8 @@ class Article < ActiveRecord::Base
 
   # Replace numeric seperator with database format
   localize_input_of :price, :tax, :deposit
+  # Get rid of unwanted whitespace. {Unit#new} may even bork on whitespace.
+  normalize_attributes :name, :unit, :note, :manufacturer, :origin, :order_number
 
   scope :undeleted, -> { where(deleted_at: nil) }
   scope :available, -> { undeleted.where(availability: true) }

app/models/article_category.rb

@@ -10,6 +10,8 @@ class ArticleCategory < ActiveRecord::Base
   #   @return [Array<Article>] Articles with this category.
   has_many :articles
 
+  normalize_attributes :name, :description
+
   validates :name, :presence => true, :uniqueness => true, :length => { :in => 2..20 }
 
   before_destroy :check_for_associated_articles