Comment 8 for bug 485966

I updated lp:~thekorn/zeitgeist/negation_switch,
 * it has wildcard support ('*' is used)
 * added logic to Event.matches_template() and Subject.matches_template()

This updates add a new convention to zeitgeist: "*" in fields which support wildcard queries must be escaped as "\*"

TODO:
 * adding helper function to escape "*"
 * adding more tests
 * documenting "!" and "*"