Excluding <reply> and <action> from random factoids

Added an exclude_verb param to lookup() to exclude
a list of verbs from the search, and used it in
the random factoid picker
Moving verb exclude list into config var

random_exclude_verb, to be precise
Merge pull request #35 from tomatosalad/master

Fixed formatting, grammar in README.md
Merge pull request #31 from cincodenada/exclude_verb

Excluding <reply> and <action> from random factoids