minor bug fixes and enhancements

- some token names have spaces in them, even multiple spaces, this caused the table to be misaligned --> fixed
- warn user if processing is going to take some seconds with a "be patient ..." message
- check if API returns an HTML page (usually a CAPTCHA web site), if so throw error
- better error checking

various updates

- checks for API status codes,
- enables crypto and metals as currencies
- more error handling
- version number updated

added cents to dollar prices

Updates to newest version of Coinmarketcap API, API key is now required

- API key is now required
- currently it is available for free

A couple of typos