use a friendlier format for !person and !persons_feelings
use && instead of `and` for booleanness #cosmetic
insert dots in the front of the name

The current implementation, which inserts the dot at the end, will ping
people they log in with underscored or numbered names like "czhang1",
which gets changed to "czhang.1".
Merge pull request #27 from jayferd/plusplus-format

Use a friendlier format for !person and !persons_feelings