Added a MAC class.
This is just a placeholder at the moment.
Initial commit of pf::MAC as inherited form Net::MAC.
Added a few basic unit tests just to make sure it behaved the way I
expected it.
Added a number of methods and tests.
Added more methods:

get_stripped(),
get_dec_stripped().
Fixed get_hex_stripped so that it does not modify the object.
Added get_dec_oui and get_oui with their tests.
Added methods for macoui2nb and mac2nb.
First "complete version".
For your consideration.
Added copyright.
Added an as_acct method.
Rewrote alias methods to point the typeglob to a sub reference instead;
Cleaner and more efficient.
Merge pull request #105 from louismunro/fix/MAC_Class

Fix/mac class.
Added a new class to represent MAC addresses.