Fix regression: markdown references should be case-insensitive.

This broke when we added the Key type.  We had assumed that
the custom case-insensitive Ord instance would ensure case-insensitive
matching, but that is not how Data.Map works.

* Added a test case for case-insensitivity in markdown-reader-more
* Removed old refsMatch from Text.Pandoc.Parsing module;
* hid the 'Key' constructor;
* dropped the custom Ord and Eq instances, deriving instead;
* added fromKey and toKey to convert between Keys and Inline lists;
* toKey ensures that keys are case-insensitive, since this is the
  only way the API provides to construct a Key.

Resolves Issue #272.

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