enzyme

[Tests] skip the linter in node 0.10

[Dev Deps] update `babel-cli`, `babel-core`, `babel-eslint`, `babel-register`, `coveralls`, `eslint`, `eslint-config-airbnb`, `eslint-plugin-import`, `eslint-plugin-jsx-a11y`, `eslint-plugin-react`, `rimraf`, `sinon`, `mocha`

[Tests] fix linter/test scripts; move files with JSX to .jsx

[Deps] update `lodash`, `object.assign`

[Fix] include method name in “single node” errors