Removed erroneous no-op comment.

A really old comment survived to this day stating that
our send_event_to_dbus method was a no-op. It has no longer
survived.

[endlessm/eos-sdk#2281]
Added critical when maybe type in payload

A check for a maybe type within given auxiliary paylaods
is now performed. If a maybe type is found, a g_critical is
logged.

The documentation for these payloads has been updated to reflect
that they should not contain maybe types.

[endlessm/eos-sdk#2281]
Merge pull request #5 from endlessm/sdk/2281

Disallow maybe types