+ New port: sublime3 (Sublime Text 3)

It looks like the binary used for executing Sublime 3 is the same
as sublime 2, so we need to make sure the two cannot be installed
at the same time. 

You do that by adding a line like so:

CONFLICTS=      linux-sublime-[0-9]*

http://www.freebsd.org/doc/en/books/porters-handbook/book.html#conflicts