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Version 6.0
===========

Overview
--------
* The FuzzyLite Libraries, namely fuzzylite and jfuzzylite, both in version 6.0, are licensed under the GNU General Public License version 3.

* By default, fuzzylite builds using C++11 instead of C++98. 

* Important performance improvements.

* Refactored the following names for the operation of engines: from activation operator to implication operator, from accumulation operator to aggregation operator.

* Renamed the term `Accumulated` to `Aggregated`.

* New activation methods decouple the activation of rules from the rule block and provide different methods for activating rules (see Activation Methods).

* New class `ActivationFactory` provides a factory of activation methods.

* New class `Benchmark` to evaluate the performance and accuracy of engines.

* New class `Complexity` to estimate the computational complexity of an engine.

* New class `RScriptExporter` to export the surfaces of an engine using the `ggplot2` library.

* New class `BinaryTerm` for binary edges.

* New `UnboundedSum` S-Norm in `SNormFactory`.

* New classes `SNormFunction` and `TNormFunction` to create custom functions on any two values using the `Function` class.

* Added description strings to `Engine`, `Variable` and `RuleBlock`

* Privatized previously protected members of classes and subclasses of `Term`, `Variable`, `Rule`, `Defuzzifier`, `[Cloning|Construction]Factory`, `Importer`, `Exporter`, amongst others.

* Improved portability by replacing `int` for `std::size_t` where necessary, thereby additionally removing warnings in Windows 64bit

* Deleted `Operation.cpp` and inlined its methods into `Operation.h`

* Updated `.travis.yml` to use Docker, and build using g++ (versions 6, 5, 4.9, 4.8, 4.7) and clang (versions 3.8, 3.7, 3.6, and 3.5). 

* Added `appveyor.yml` to use continuous integration in Windows under Visual Studio 2013 and 2015.

* Added some unit tests and support for future unit tests.

* Bug fixes.

* New example of hybrid engines.

* New example on obstacle avoidance for Mamdani, Takagi-Sugeno, and Hybrid engines.

* New R scripts for each example and its respective surfaces in `pdf` formats.