v0.5.5 - Pagination links, a new generator, request option control, and bug fixes

New features:

• Request options can be controlled with configuration options: config.allow_include, config.allow_sort, and config.allow_filter.
• A Resource Generator has been added.
• Pagination links are now generated for related resource requests.

Bug fixes:

• using filter_records(filters, options).count(:all) to fix an error in Postgresql's GROUP BY clause.
• The title and details of Validation Errors have been switched.
• When using non ActiveRecord based resources an error was happening if ActiveRecord was not loaded.
• Pagination links have been fixed for results that were smaller than a full page size.