v4.1.2

Fixes

• In IE 6-8, Date inside the function expression does not reference DateShim (#303)
• Date: Ensure all code paths have the correct constructor property
• Date: Don't copy non-own properties from original Date

Tests

• Test up to io.js v2.0.0
• Adding sanity check tests for ES5 Number constants.

Dev Dependencies

• Update uglify-js, eslint, semver

Refactors

• Simplify isPrimitive check.