Release Name: 0.1.6

Notes:
Doodle is a gem for simplifying the definition of Ruby classes by
making attributes and their properties more declarative. Doodle is
eco-friendly: it does not globally modify Object, Class or Module.


Changes:
== 0.1.6 / 2008-05-08
- Features:
  - short cut syntax for #must - can now specify constraints like
    this:
      must "size > 0"
      must "self =~ /[A-Z]"
    which will be evaluated as if you had written this:
      must "self =~ /[A-Z]" do |v|
        v.instance_eval("self =~ /[A-Z]")
      end
  - prefixed more public but undocumented methods with 'doodle_' to avoid clashing with
    common names (e.g. parents, attributes, validations, etc.)
  - renamed Doodle::Attribute Doodle::DoodleAttribute for same reason
  - updated specs to reflect name changes
  - attribute level validation messages now denote containing class
  - major refactoring of #has method - collections now handled by
    specialized attribute collector classes

- Bug fixes:
  - can now load keyed collection from hash