require underscore

Signed-off-by: Tomas Neme <lacrymology@gmail.com>
start doesn't get a config

Signed-off-by: Tomas Neme <lacrymology@gmail.com>
The only option for start() is the time span

Signed-off-by: Tomas Neme <lacrymology@gmail.com>
replace boundaries for windows in tests

Signed-off-by: Tomas Neme <lacrymology@gmail.com>