Running the example fails

まだ誰も着手していません。

I've got the following trace :
```
$ ./run.sh
> simple@1.0.0 install /tmp/cmake-node-module/test/simple
> cmake-node-module

-- The CXX compiler identification is GNU 8.2.1
-- The C compiler identification is GNU 8.2.1
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
CMake Warning at node_modules/@mapbox/cmake-node-module/module.cmake:64 (message):
[Node.js] Unused arguments: 'INSTALL_DIR;lib'
Call Stack (most recent call first):
CMakeLists.txt:8 (add_node_module)

-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/cmake-node-module/test/simple/build
Scanning dependencies of target simple.abi-64
[ 50%] Building CXX object CMakeFiles/simple.abi-64.dir/simple.cpp.o
[100%] Linking CXX shared library simple.abi-64.node
[100%] Built target simple.abi-64
npm WARN simple@1.0.0 No description
npm WARN simple@1.0.0 No repository field.
npm WARN simple@1.0.0 No license field.

audited 1 package in 2.257s
found 0 vulnerabilities

internal/modules/cjs/loader.js:583
throw err;
^

Error: Cannot find module './simple.abi-64'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
at Function.Module._load (internal/modules/cjs/loader.js:507:25)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:20:18)
at Object. (/tmp/cmake-node-module/test/simple/simple.js:1:80)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
[1] 4465 exit 1 ./run.sh
```

test/simple で ./run.sh を実行し、test/simple/simple.js からの失敗を調査します。add_node_module の呼び出し箇所にある CMakeLists.txt と、64 行目付近の node_modules/@mapbox/cmake-node-module/module.cmake を読み、その後、ビルドされた .node ファイルと require されているパスを比較します。例が module-not-found エラーなしで正常に実行されれば完了です。

索引モデルが issue の本文から書いたものです。