Refactor/general tidy up

[mst101]

Notable changes:

• Improve the naming of some variables e.g. open/close
• Have a data property called view from which the picker computed property (previously named currentPicker) can be derived
• Emit set-view events with a view parameter as opposed to emitting change-month-calendar or change-year-calendar
• Rename picker components to PickerDay, PickerMonth and PickerYear
• Tweak some tests to improve coverage

[mst101]

N.B. In case the last couple of commits need more explanation, please read this.

[MrWook]

Looks awsome to me. If you resolve the conflicts and don't have anything else we can merge it

[mst101]

Ok thanks. I think this will do, for now...

[mst101]

@MrWook - Actually, on second thoughts, there is probably a bit more refactoring that we can/should do before tackling the keyboard navigation. I'm thinking:

• Renaming days / months / years to cells
• Renaming changeMonth / changeYear / changeDecade to changePage (as you have done in your keyboard navigation POC)
• Maybe some other things too?

Let me have a go at this today...

[mst101]

@MrWook - ok, I think I'm done with the tidy-up. Please see what you make of it. Cheers.