Begin moving Moose::Attribute and Moose::Class into Moose::Meta::*

diff --git a/lib/Mouse/Attribute.pm b/lib/Mouse/Meta/Attribute.pm
similarity index 100%
rename from lib/Mouse/Attribute.pm
rename to lib/Mouse/Meta/Attribute.pm

diff --git a/lib/Mouse/Class.pm b/lib/Mouse/Meta/Class.pm
similarity index 100%
rename from lib/Mouse/Class.pm
rename to lib/Mouse/Meta/Class.pm