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.
