Allows attachments on news (#1972).
Locales update.
Display of multi custom fields.
Display custom_field_values instead of custom_values.
Code cleanup.
Allow existing single value custom fields to be changed to multiselect.
Do not validate blank default custom field value.
Adds support for multiselect custom fields (#1189).
Support for nested array in API builder.
test: add attachment tests at unit mail handler test for Rails3
