v2.3, as uploaded to CTAN on 2013/07/03

Changes:

* New experimental lookups: ``kpse`` (kpathsea), ``my`` (callback)
* Precedence of texmf over system fonts can be requested
  using the ``--prefer-texmf`` option of luaotfload-tool
* Resolve file names to full paths at later stage
* Rewrite the output of ``\fontname`` via ``patch_font`` callback
* Allow blacklisting directories
* Drop compatibility layer
* Remove dependency on luaotfload-lib-dir (references to dir.glob() and
  dir.mkdirs())
* luaotfload-tool now displays extensive information about a font if given
  the argument --inspect
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