Fixes:
- Bug where high value was shown instead of last value
- Typos in Comments

Adds:
- Code comments to make maintenance easier
- spencer.py file which mirrors the actual workflow file
- Bundle Id
- Opens btcmine.com by default (instead of mining.bitcoin.cz)

Changes:
- Bundle Id now identifies workflow
- Website now links to alfred forums post http://www.alfredforum.com/topic/2219-bitcoin-exchange-rate/
- Alfred readme gives clearer instructions
- Opens btcmine.com instead of slush (because I switched off of slush)
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