Added wheels, frames, improved inventory printing.
Removed old bike defs, tweaked frame weights.
Tiny price tweak, customer 2 could afford too many bikes.
Formatting tweaks, added ul_string function.
PEP 8 tweaks.
Removed check I consider unneccessary.
Added PEP 8 __future__ imports, updated print statements.
Manufacturers added, shops don't stock inventory yet.
Formatting tweaks.
mfg fields in Bicycle objects were botched up.
Fun with regex's for formatting money.
Added docstrings to helper functions.
clean-up... moved customers into an array.
make customers buy most expensive bike they can afford