Basic loadLAS unit test

[dcslagel]

@JustinGOSSES,

This change implements a simple initial unit test for loadLAS() in dist/index.js.

• It checks for node environment and requires the 'fs' module if in node so it can read the las file.
• It uses the assets/lassio_test.LAS. This looked like a complete but short example. I didn't move or copy it into the dist/test/ directory. Let me know if you want test las files in a certain directory path.
• It adds a node script to package.json to run the test with npm run test-lasload

Let me know if this change could be accepted (or rejected) or needs some additional changes before merging.

Thanks,

DC

[JustinGOSSES]

@dcslagel Looks like a suitable approach. I'll merge.

LASIO has a good suite of test LAS files that welly also uses. Some of them are named by their imperfections. Long-term plan was to use all or a subset of them in more advanced test suite eventually.

https://github.com/kinverarity1/lasio/tree/master/tests/examples

[dcslagel]

@JustinGOSSES,

Great. I'll experiment with adding another LASIO test file to the wellio.js test suite.

Thanks,

DC