Allow DOM props to pass through Link to the actual a tag

[tptee]

Not sure why I didn't do this before, but now all DOM props (including ARIA attributes) work on <Link>, not just className and style.

/cc @divmain @baer

[coveralls]

Coverage remained the same at 98.305% when pulling d91b793 on feature/pass-through-dom-props into ee1ef35 on master.

[coveralls]

Coverage remained the same at 98.305% when pulling d91b793 on feature/pass-through-dom-props into ee1ef35 on master.

[baer]

@tptee you should invite others to see little-router progress. I'm sure christopher would love to see this.

[alexlande]

👏

[divmain]

👍

[cjseattle]

Nice!