Fix error in email validation

lib/data_mapper/validation/rule/formats/email.rb

@@ -27,7 +27,7 @@ module Formats
           end
           digit          = '0-9'
           atext          = "[#{letter}#{digit}\!\#\$\%\&\'\*+\/\=\?\^\_\`\{\|\}\~\-]"
-          dot_atom_text  = "#{atext}+([.]#{atext}*)+"
+          dot_atom_text  = "#{atext}+([.]#{atext}+)+"
           dot_atom       = dot_atom_text
           no_ws_ctl      = '\x01-\x08\x11\x12\x14-\x1f\x7f'
           qtext          = "[^#{no_ws_ctl}\\x0d\\x22\\x5c]"  # Non-whitespace, non-control character except for \ and "

spec/integration/format_validator/email_format_validator_spec.rb

@@ -42,7 +42,12 @@ def valid_attributes
         'Job@Book of Job',
         'test@localhost',
         'J. P. \'s-Gravezande, a.k.a. The [email protected]',
-        "[email protected]\nsomething after the newline"].each do |email|
+        "[email protected]\nsomething after the newline",
+        '[email protected]',
+        '[email protected]',
+        'mal.formed@example.',
+        '[email protected].',
+        '[email protected]'].each do |email|
     describe "with email value of #{email} (non RFC2822 compliant)" do
       before :all do
         @model = DataMapper::Validations::Fixtures::BillOfLading.new(valid_attributes.merge(:email => email))