Moose module to default "is" to "ro" or "rw" for all attributes

 MooseX::HasDefaults allows one to set a default of "ro" or "rw" for the "is"
 of all Moose object "has" attributes, thus saving some typing.
 .
 MooseX::HasDefaults is similar to, but requires less typing than,
 MooseX::AttributeDefaults and MooseX::Attributes::Curried.