Added support for "base" in config options, in order to do a zero-based position #12
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Added support for "base" in config options, in order to do a zero-based position. The reason for this is that Ruby, MongoDB, and Javascript all use zero-based arrays as a standard, so in my app I found I was doing a lot of -1 when reading / +1 when writing.
The default config value is 1, which keeps current behavior intact.
There is an added public accessor "orderable_base" to get this attribute.
Have added appropriate Rspec tests.
Have also bumped minor version. According to sem-ver it's an API change but does not break the existing API or change existing behavior.
Lastly, please look at the change to "bottom_orderable_position" method and confirm it is suitable. I believe are the ".map(&:to_i).max" part are Ruby array methods, not a mongo instruction, so it should not affect performance.