Improving accessibility

Closes #3 I simply added a label for the search and threw in an aria-live attribute to the search results. 

I checked this with the ATL, and they agree this is more than enough. The other options were to

1. use aria-live with aria-atomic and aria-label and aria-relevant to just speak the label when it changed
2. use a hidden div and dynamically update that div's contents with like "results changed, X new results"

1 was hokey, not descriptive enough and 2 was probably overkill..