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New build options
-----------------
* Add option BUILD_TESTING by default ON
See https://cmake.org/cmake/help/v2.8.12/cmake.html#module:CTest
* Simplify library type selection using standard option BUILD_SHARED_LIBS
See https://cmake.org/cmake/help/v3.0/variable/BUILD_SHARED_LIBS.html
yamlConfig.cmake
----------------
* Generate and install yamlConfig.cmake, yamlConfigVersion.cmake and yamlTargets.cmake
* Bump CMake version and explicitly associate include dirs with targets
See https://cmake.org/cmake/help/v3.0/manual/cmake-buildsystem.7.html#include-directories-and-usage-requirements
* Ensure building against libyaml using "find_package(yaml)" uses expected compile options: Set HAVE_CONFIG_H
as private compile option, YAML_DECLARE_STATIC as public
Testing
-------
* Build all examples from "tests" directory
CMake Best practices
--------------------
* configure "config.h" based on version info found in CMakeLists.txt
* Ensure buildsystem re-generation listing sources (best-practice)
It is not recommended to use GLOB to collect a list of source files from
the source tree. If no CMakeLists.txt file changes when a source is added
or removed then the generated build system cannot know when to ask CMake
to regenerate.
See https://cmake.org/cmake/help/v3.8/command/file.html
Compilation warnings
--------------------
* Set _CRT_SECURE_NO_WARNINGS if building using VisualStudio
This will avoid warnings like this one:
```
C:\projects\libyaml\tests\run-emitter.c(268): warning C4996: 'fopen':
This function or variable may be unsafe. Consider using fopen_s instead.
To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for
details.
```
Continuous Integration
----------------------
* travis: Install CMake >= 3.x using scikit-ci-addons
* Add comments to appveyor.yml and run-tests.sh
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