* Update to the latest data.json from github.com/Fyrd/caniuse.
* Refactor so eras are not hardcoded in browserVersionLookup.
* Add credit to caniuse.com for the data.
* Show the date of the latest data update in the UI.
Merge pull request #5 from EvilOatmeal/use-latest-data

Use most recent data from caniuse