Remove deprecated methods

[seejohnrun]

No description provided.

[avit]

to_hash also outputs a :start_date key. Should these be changed to :start_time for consistency?

[jessereynolds]

I have the same question. When looking at the to_hash output (or to_yaml) it seems odd that we have start_date and end_time. I think consistency here would be great. But perhaps there's a reason they're different?

      {
        "start_date": "2013-01-28 08:00:00 +1030",
        "end_time": "2013-01-28 18:00:00 +1030"
      }

[seejohnrun]

I think we need to move to start_time. The only reason that they're different is that end_time was added after the methods were changed.

from_yaml and from_hash still probably need to be able to deserialize start_date

[avit]

Added IceCube.compatibility to deal with this transition; released in 0.12.0. See UPGRADING file.