Fixes #39.

- Use `irc.foo` notation instead of `irc:foo`. It still
  supports the `irc:foo` usage, but will helpfully issue
  a warning with the location of the offending code.
- Remove unused arguments from functions.

As the list command is deprecated, this reference to it should be changed.

Default value is false.

Fixes bug where `Server:  asdf` (note the double space)
gets taken as an empty command name.

Mea culpa. It was possible an error caused `require` to
not be reset, causing possible errors in the future.

Fixes #35.

- Merge `list` into `help`.
- Use `table.concat` to remove trailing comma.

Also minor fixes.

Also minor style fixes.

This allows configuring the mod from the GUI.

Fixes an issue with `hooks.lua` calling the (old, disabled)
`require` function.

Follows #23

Allow server admin to specify how long until a reconnect occurs after a timeout (default 600 seconds) without having to modify the core code.

Debian's LuaSocket packages are broken.  Then seem to
package the 5.1 version of the library as simply a copy
of the 5.2 version; however, the libraries are incompatible.
Additionally, the package seems to take a number of
different names depending on the version of the distro.
However, the LuaRocks package seems to be fine, so install
that first and then install LuaSocket through LuaRocks.