Schedule find_occurrence when interval is greater than 1 won't use the start date causing invalid results

[CoreyWinkelmannPP]

I found when the find_occurrences function is called in Schedule that it wants to start from the opening_time when looping to find the occurrences between the begin_time and end_time when the interval is greater than 1. When the interval is > 1 I believe it should begin looping at the start_time to make sure when it gets to the opening_time and the closing_time that it knows that the occurrence falls in the range.

I added @interval in daily_interval.rb, weekly_interval.rb, monthly_interval.rb, and yearly_interval.rb to allow Rule to have access to it. Then I altered the full_required? method to check the interval and make sure it exists and if > 1 to return true.

# Whether this rule requires a full run
def full_required?
  !@count.nil? || (! @interval.nil? && @interval > 1)
end

[seejohnrun]

This is an exceptional pull request. Thanks so much, and apologies for the delay.
Is there a reason you kept @interval off of the hourly, minutely, secondly classes? seems it applies just as well (if not as noticably) there

[CoreyWinkelmannPP]

No reason whatsoever. I was using the daily, weekly, and monthly intervals in the code I was writing and I didn't even look at the other intervals. Thanks for getting this in!

[seejohnrun]

Cool - I'll add it to the other classes as well and it will go out with 0.9.0
Thanks again