String-similarity

Update all dependencies to latest

- Including UMD build

* Performance improvement for `compareTwoStrings(..)`: now O(n) instead of O(n^2)
* The algorithm has been tweaked slightly to disregard spaces and word boundaries. This will change the rating values slightly but not enough to make a significant difference
* Adding a `bestMatchIndex` to the results for `findBestMatch(..)` to point to the best match in the supplied `targetStrings` array

* Removed production dependencies
* Updated to ES6 (this breaks backward-compatibility for pre-ES6 apps)