Returns an empty array instead of null in chrome.nfc.getDevices when there's no results
Merge pull request #7 from GoogleChrome/returnArrayGetDevices

Returns an empty array in chrome.nfc.getDevices when there are no results
Reverted renaming findDevices in getDevices
Merge pull request #8 from GoogleChrome/revertGetDevices

Reverted renaming findDevices in getDevices