fix interval and repetition options

It seems that interval and repetition options need to be converted from string to number in initialization.
Update out_notifier.rb
fix config values in tests

All non-default config values from config files come not as int, but string.
fix config values in tests

All non-default config values from config files come not as int, but string.
Merge pull request #3 from nknytk/patch-1

fix interval and repetition options