cleaning everything

src/spline/BezierCurve.cpp

-#include "API/BezierCurve.h"
-

src/spline/CubicFunction.cpp

-#include "API/CubicFunction.h"
-

src/spline/ExactCubic.cpp

-#include "API/ExactCubic.h"

src/tests/spline_test/CMakeLists.txt

 cmake_minimum_required(VERSION 2.6)
 
-include_directories("${PROJECT_SOURCE_DIR}/src/spline/API")
+include_directories("${PROJECT_SOURCE_DIR}/include")
 
 add_executable(
         spline_tests Main.cpp

src/tests/spline_test/Main.cpp

 
-#include "CubicFunction.h"
-#include "ExactCubic.h"
-#include "BezierCurve.h"
+#include "spline/CubicFunction.h"
+#include "spline/ExactCubic.h"
+#include "spline/BezierCurve.h"
 
 #include <string>
 #include <iostream>