Can we have some rest API improvements?

[npomfret]

For transfers

• remove need to specify market symbol (it doens't make sense in this case AND it would reduce API calls) and replace with a currency symbol
• add the crypto address
• add the network transaction id
• fix the fee (it's always zero)

For trades:

• add a taker / maker flag
• remove the requirement for a market symbol (to reduce API calls)

Order

• add order history endpoint (don't force use the specify market symbol)

I know the web socket feed is preferred to the REST API but it doesn't help when querying for historical data.

[npomfret]

@david-coinfloor @whitslack anyone still there???