bump next version to 2.1300

Now we're on the 2.14 release line! Any further bug fixes that are needed to
the 2.12 series should be performed and released on the stable/2.12 branch.

Also note that Moose::Manual::Support restricts the release of 2.1400 to no
earlier than October 2014.
Core overloading support for roles

This is more or less a straight port of MooseX::Role::WithOverloading.

I added some checks for overloading conflicts in MMR::Summation. However,
these need tests and I suspect that the implementation may be a bit off. Next
step is fixing that.

We now properly detect fallback & method conflicts in overloading setting
during role summation and when applying a role to another role.

Also:
Added docs on overloading to Moose::Manual::Role
Add Changes & Delta for core overloading support
Add conflict entry in metadata for with MXRWO <= 0.14
Deal with pod coverage errors

Either by making things private or explicitly excluding them
whitespace
Merge branch 'PR/74'

Core support for overloading (closes #74)