v0.7.2, 2014-02-26 -- Initial release.
v0.7.3, 2014-02-27 -- Insert the missing `isbn_stdin_validate`.
v0.7.4, 2014-02-28 -- All methods and scripts work with identifier `979`.
v0.7.5, 2014-03-01 -- Fix small errors and a small example on how to use the library.
v0.8.1, 2014-03-02 -- Uses urllib2 instead of httplib2.
v0.8.2, 2014-03-03 -- Refactor `meta` and add Google Books API.
v0.8.3, 2014-03-03 -- Performance and stability.
v0.8.4, 2014-03-04 -- Performance and stability 2.
v1.0.0, 2014-03-05 -- Stable version.
v1.0.1, 2014-03-05 -- Correcting an annoying typo!
v1.0.2, 2014-03-06 -- A new `editions` method and script and a lot of small tweeks.
v1.0.3, 2014-03-07 -- Change in the way providers hook to main program.
v1.0.4, 2014-03-07 -- (NOT RELEASED) Changed interfaces for devs, bump version to 2.0.1.
v2.0.1, 2014-03-08 -- isbntools.dev!
v2.0.2, 2014-03-09 -- Major module rearrange.
v2.0.3, 2014-03-11 -- Better error handling (fix issue: #2 err-regression).
v2.0.4, 2014-03-12 -- Fixing major regression error in isbndb.py.
v2.0.5, 2014-03-13 -- Webquery customization by `function passing`.
v2.0.6, 2014-03-14 -- New method `isbn_from_words`.
v2.0.7, 2014-03-15 -- Added Metadata class (to structure, clean and validate data).
v2.0.8, 2014-03-15 -- Merge provider and fixed 'not valid metadata error'.
v2.0.9, 2014-03-15 -- (NOT RELEASED) much improved `merge` provider with waterfall backup (new middle version)
v2.1.1, 2014-03-17 -- Threaded calls in `merge` and `openl` provider.
v2.1.2, 2014-03-18 -- User options in conf file (UNIX) & robust mapping canonical <- records.
v2.2.1, 2014-03-19 -- Added `mapper`, `vias` and advanced `Metadata` (bump middle version).
v2.2.2, 2014-03-20 -- Better output formatting & simplified exception names.
v2.2.3, 2014-03-20 -- (NOT RELEASED) more consistent module's names (bump middle version)
v2.3.1, 2014-03-21 -- More consistent module's names (changes dev interface, so bump middle version)
v2.3.2, 2014-03-24 -- Plugin framework.
v2.3.3, 2014-03-24 -- Fix false report because cache.
v2.3.4, 2014-03-27 -- Improved support for Windows.
v2.3.5, 2014-03-28 -- Windows with the same features as UNIX.
v2.3.6, 2014-03-31 -- Small fixes and standalone version for Windows.
v2.3.7, 2014-04-03 -- Small fixes and improvments.
v2.3.8, 2014-04-07 -- A more sophisticated merge.
v2.3.9, 2014-04-07 -- Fix merge errors.
v3.0.0, 2014-04-08 -- Support for Bibtex, EndNote, RefWorks and Word.
v3.0.1, 2014-04-09 -- Multiple references from Google Books.
v3.0.2, 2014-04-14 -- Added BibJSON format.
v3.0.3, 2014-04-15 -- Small fixes and ReadTheDocs.
v3.1.0, 2014-04-22 -- Small fixes and clear code (some unused methods are not available anymore).
v3.1.1, 2014-04-24 -- Simpler providers & multi `processor`.
v3.1.2, 2014-04-28 -- Python 3 support.
v3.1.3, 2014-04-28 -- Fix travis error.
v3.1.4, 2014-05-04 -- Support py26,27,33,34 and pypy. Full support for virtual environments (close #14).
v3.1.5, 2014-05-11 -- Unicode to LaTeX in bibtex (for devs), a  more robust `merge` (NOT RELEASED).
v3.2.1, 2014-05-12 -- Unicode to LaTeX in bibtex (for devs), a  more robust `merge`, new namespaces (lab and contrib).
v3.2.2, 2014-05-12 -- Fix conf error (close #40).
v3.2.2a, 2014-05-13 -- Fix installer.
v3.2.3, 2014-05-25 -- EAN13, doi, rename files using metadata, conf editor and new features to make easier to contrib.
v3.2.4, 2014-06-01 -- Glob rename (ex *.pdf, *.epub, ...) and small fixes.
v3.2.5, 2014-06-02 -- Cache for metadata - first iteration (NOT RELEASED).
v3.3.1, 2014-06-08 -- Cache for metadata and 'opf' format.
v3.3.2, 2014-06-10 -- Fix bug #60 (`isbn_meta` and `isbn_ren` don't work for system installs).
v3.3.3, 2014-06-16 -- A more robust install for `system installs` in UNIX systems.
v3.3.4, 2014-06-23 -- Fix bug in 'notisbn' and improved install.
v3.3.5, 2014-06-25 -- Fix bug 'develop' and optional in-memory cache.
v3.3.6, 2014-06-30 -- Add 'entry_points' plugins support.
v3.3.7, 2014-07-07 -- Fix bug #68.
v3.3.8, 2014-07-13 -- Prepare for 'isbnlib'.
v3.3.9, 2015-01-15 -- Fix bug #75 and acept 'x' in ISBNs.
v4.0.1, 2015-01-27 -- Big code split! 'isbntools' uses 'isbnlib' for the core code.
v4.0.2, 2015-01-28 -- Fix bug #77.
v4.0.3, 2015-02-28 -- (NOT RELEASED) Bump middle version.
v4.1.1, 2015-02-06 -- Add a REPL, log files and check messages.
v4.1.2, 2015-02-11 -- Fix bug #82.
v4.1.3, 2015-02-12 -- Fix bug #83.
v4.2.1, 2015-02-27 -- Fix bug #84, add 'cover' and 'desc' features.
v4.2.2, 2015-03-16 -- ThingISBN service for editions and CoversCache, fix bug #85.
