Removed `--strict`, added extensions to writer/reader names.

* The `--strict` option has been removed.
* Instead of using `--strict`, one can now use `strict` instead of
  `markdown` as an input or output format name.
* The `--enable` and `--disable` optinos have been removed.
* It is now possible to enable or disable specific extensions
  by appending them (with '+' or '-') to the writer or reader
  name.  For example `pandoc -f markdown-footnotes+hard_line_breaks`.
* The lhs extensions are now implemented this way, too; you can
  use either `+lhs` or `+literate_haskell`.

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