Clean up files

[ryanjm]

schedule_item and schedule_todo were specific to the original intention of this code. We should take those out. I think the main thing this changes is adding an event_start attribute to schedule.

It might be also worth while to move code into three separate files in order to help clean things up / make them easier to test.

• event_scheduler - This would have the API's that a user should be interacting with
• schedule_decoder - Methods that are just for translating the database information to Ruby specific entities
• schedule_math - This would be the methods that are doing the specific math required to figure out next events.

I'm up for other naming methods and/or a different structure. Let's discuss here.

[ryanjm]

I'll work on refactoring the files into smaller objects later.