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[skip ci]
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* Adding fix for #75, rename requires to needs * Removing check for install commands (should still be run in subproject)
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Add path exists validator
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`add_options` should be `add_option`.
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[skip ci]
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[skip ci]
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[skip ci]
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[skip ci]
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* Addind simple flag callback * Give flag function a new name, old name only on C++14 * Fixing reference to destroyed function * Better GCC 4.7 support, travis prepared for C++17 (not used yet) * Updating documentation