modules: Initial brain dump.
Added a TODO file
modules/_include: Changed MARGS -> PARAMS
modules: Implemented the getparam function, and param parsing
modules/echo: Implemented the echo module.

It just simply echoes the value of the "message" parameter, or all of
the arguments if the "message" parameter was not specified.
modules: "Bulletproofed" the keyword param parsing
Merge branch 'echo-module'