Add statistics and usage tracking #1

Start tracking how many requests are made on each API key.

Perhaps turn verified_api_keys into a list of dictionaries in order to do this.

Example:
[{key: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxx-xxxxxxxx', totalRequestsMade: '32', lifeTimeRequestsMade: '233', owner: 'Snuggle'}, {key: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxx-xxxxxxxx', totalRequestsMade: '4', lifeTimeRequestsMade: '233', keyOwner: 'Shruggle'}]