CMAKE_INSTALL_PREFIX does not mandatory changed

[soroshsabz]

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ITNOA

I think it is very good to have a cmake option that can be set to does not change CMAKE_INSTALL_PREFIX to "${PROJECT_BINARY_DIR}/install", because I think CMAKE default install prefix is very better than custom set.

[soroshsabz]

related to #34

[acki-m]

And why? I don't want that a library is installed in some system location by default. everything should be placed inside the build folder However, you can set the CMAKE_INSTALL_PREFIX to whatever you want, when it is not working, I will fix it