td-1.5.0.js

• Improve browser support to include IE8 without having to include polyfills
• Improve tests to run on older browsers
• Remove legacy version of td-js-sdk
• Remove bower support
• Replace karma with zuul
• Replace gulp with npm run-scripts
• Remove examples
• Replace chai with expect.js
• Replace lodash with lodash-compat
• Update lodash file so we only include the parts we need in order to reduce the bundle size
• Break out utility functions and add tests
• Update code to follow Standard style
• Add Base64 dependency
• Add invariant dependency
• Remove es5-shim dependency