Fix #183: Deck parser doesn't too eagerly replace ampersands.

The parser only replaces ampersands if they're preceded by a character which isn't a capital letter, since that would be the case for acronyms like "R&D".

This deck erroneously replaces R&D but now doesn't:
```
4 R&D's Secret Lair
4 Look at Me, I'm R&D
4 Fire & Ice
```