Guard measureLayout, add default props. (soldotno#9)

Adds eslint and fixes some of the issues with --fix option. (soldotno#6)

* Add eslint and run eslint --fix.

* 2.0.2

Upgrade package (soldotno#4)

* Fix typo

* Update package.json

Update README, package.json and .editorconfig. (soldotno#2)