v2.5.1 - Important bug fixes for build environment, minor improvements.

Fixes and Improvements

• Fixed: Add IAddVariantOptions type to the carousel "dragging" class. [PR #473]
• Fixed: Remove extra "typeof". [Issue #476] and [PR #471]
• Fixed: Fire change event when the tag close icon is clicked and item is removed. [Issue #252] and [PR #411]
• Fixed: Stepper reset handler. [PR #381]