add shopify app credentials to config defaults
move config to lib/shopify/config.json

to make shopify module more self-contained
ignore textmate properties
test that web/connects/config.js loads config
need two test shops for two tax scenarios:

1. taxes NOT in product prices
2. taxes INCLUDED in product prices
list of products for testing tax cases
fixtures for tax tests
extract order_conversion, start testing tax scenarios
switch from bigdecimal to bignumber.js, add reconcileWith test helper

bigdecimal has bugs with trailing zeros and hence equals
shopify-node-api upstream changes
order_converter works with taxes included in product price

prices reconcile only if we use 3 decimal places in the item price
DRY nconf to module and make item price places and rounding mode configurable
use full precision as far as possible in calc