Added article for the Ambient Light API
Added article for the Proximity API
Merge pull request #556 from AurelioDeRosa/patch-1

Added article for the Ambient Light API
Merge pull request #559 from AurelioDeRosa/patch-2

Added article for the Proximity API
Added demo for Speech Recognition API
Added demo for User Timing API
Merge pull request #560 from AurelioDeRosa/patch-1

Added demo for Speech Recognition API
Merge pull request #561 from AurelioDeRosa/patch-2

Added demo for User Timing API
data update