poll resolution read incorrectly

[crashdemons]

https://github.com/NShadeIV/Cron/blob/master/src/org/aztecmc/plugins/cron/CronPlugin.java#L56

The plugin looks for "bukkitRunnable-poll-resolution" but the default config contains "cron-poll-resolution" instead

This results in the provided defaults, but it would be nice if it loaded the right values.

EDIT: defaults were provided in plugin, not 0.

Not the cause of any timing issues we're having.

[crashdemons]

This also occurs in bukkitRunnable-timezone / cron-timezone