Use GNUInstallDirs module and fix cmake directory location

CMakeLists.txt

@@ -25,10 +25,14 @@ set(tinyobjloader-examples-objsticher
   )
 
 #Install destinations
-set(TINYOBJLOADER_CMAKE_DIR lib/cmake)
-set(TINYOBJLOADER_INCLUDE_DIR include)
-set(TINYOBJLOADER_LIBRARY_DIR lib)
-set(TINYOBJLOADER_PKGCONFIG_DIR lib/pkgconfig)
+include(GNUInstallDirs)
+
+set(TINYOBJLOADER_CMAKE_DIR ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/cmake)
+set(TINYOBJLOADER_DOC_DIR ${CMAKE_INSTALL_DOCDIR})
+set(TINYOBJLOADER_INCLUDE_DIR ${CMAKE_INSTALL_INCLUDEDIR})
+set(TINYOBJLOADER_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR})
+set(TINYOBJLOADER_PKGCONFIG_DIR ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+set(TINYOBJLOADER_RUNTIME_DIR ${CMAKE_INSTALL_BINDIR})
 
 option(TINYOBJLOADER_BUILD_TEST_LOADER "Build Example Loader Application" OFF)
 option(TINYOBJLOADER_COMPILATION_SHARED "Build as shared library" OFF)
@@ -64,7 +68,7 @@ if(TINYOBJLOADER_BUILD_OBJ_STICHER)
   install(TARGETS
     obj_sticher
     DESTINATION
-    bin
+    ${TINYOBJLOADER_RUNTIME_DIR}
     )
 endif()
 
@@ -101,7 +105,7 @@ install(TARGETS
   PUBLIC_HEADER DESTINATION
   ${TINYOBJLOADER_INCLUDE_DIR}
   RUNTIME DESTINATION
-  bin
+  ${TINYOBJLOADER_RUNTIME_DIR}
   )
 install(EXPORT
   ${PROJECT_NAME}-targets
@@ -113,6 +117,11 @@ install(FILES
   DESTINATION
   ${TINYOBJLOADER_INCLUDE_DIR}
   )
+install(FILES
+  LICENSE
+  DESTINATION
+  ${TINYOBJLOADER_DOC_DIR}
+  )
 install(FILES
   "${CMAKE_CURRENT_BINARY_DIR}/tinyobjloader-config.cmake"
   "${CMAKE_CURRENT_BINARY_DIR}/tinyobjloader-config-version.cmake"