do not omit META.* from distribution

MYMETA.* files as well as META.* were being skipped. This blog post
http://weblog.bulknews.net/post/44251476706/stop-shipping-mymeta-to-cpan
seems to suggest only the MYMETA.* files need to be skipped.
fix broken link in documentation
increase version number
implement action class PDL::NDBin::Action::Min
implement action class PDL::NDBin::Action::Max
update documentation
add note on version numbers with trailing zeroes
remove duplicated tests
require PDL::Type objects to specify type in action class constructors
refactor type testing in tests
update changelog
require Module::Pluggable 3.1 or higher for test suite
v0.011

 - try to avoid test failures with old versions of Module::Pluggable (Edward
   Baudrez)
 - changed the syntax to specify the type of the output piddle in the action
   class constructors. Previously, this was achieved by passing a coderef:
      PDL::NDBin::Action::Avg->new( ..., type => \&PDL::double );
   This has now changed to
      type => double         # or 'type => PDL::double'
   The new syntax is simpler and arguably clearer. (Edward Baudrez)
 - implemented the action classes PDL::NDBin::Action::Min and
   PDL::NDBin::Action::Max (Edward Baudrez)
 - various minor fixes (Edward Baudrez)