fix: there were problem with error_messages_for helper and its message and 
message_header parameters. when tried to provide any of them, globalite 
ignored them. now it works as expected

enhancement: there was not any support to localize field names in 
validator messages. it couldn't work for anybody because you always got 
something like this:

Name cannot be empty (en)
Name nie może być puste (pl)

well, Name should be replaced with 'Nazwa' in polish.

it works by convention now. when you have validator:

validates_presence_of :name, :email, :age

its by convention that you have in your yml language files entries with 
the same keys: name:, email:, age:.
when you dont provide such a key, the behaviour is without any changes, 
just like without i18n plugin.
ive also added possibility to get rid of field name in custom validation 
message with :message attribute.

validates_uniqueness_of :name, :message => 'my message'

so from now you can have:

my message
instead of
Name my message