Depending on where you are, and what you use, you might find the outdated doc directory inside the main release file and the contrib tree examples in the contrib release file, enough. That covers 1.4.1 The git repository has its doc files updated, plus some Doxygen embellishment:
The code is well documented and you can read the sources if in doubt.
Furthermore, there is an independent documentation effort going on at wikia:

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