Use a regex to split tokens in parser

[evenator]

NMEA uses a * character to delimit the beginning of the regex, so use a regex that matches * and , as the field delimiter.

Fixes #86

[rgov]

Should this also remove the field.strip(',')? If you are splitting on , there will not be any , to strip off.

[evenator]

That's a good point @rgov. I'll remove the strip.

[evenator]

Note to self: This needs a final test and then it's ready to merge.

[evenator]

I've regression-tested this PR. I'm still waiting for confirmation from @NearLinHere that it resolves #86.