Add CLI command "marko show birthday" to show "birthday information"

 for Mark Spencers upcoming 30th birthday.

To enable, run `make menuselect` and select the option MARKO_BDAY under Compiler Flags.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@58742 65c4cc65-6c06-0410-ace0-fbb531ad65f3