Command example now in markdown code chunk

Added backticks to denote start of two examples for the /iec command so the <input or output> will actually render.
Merge branch 'master' of https://github.com/ttk2/ItemExchange
Fixed serialization delimiter to allow sale of signed books
Merge pull request #1 from rlittlefield/master

Fixed sale of signed books. Command example now in markdown code chunk