Trade count > 50

[jorfermo]

As oanda says in the api documentation:

Trades can be paginated with the count and maxId parameters. At most, a maximum of 50 trades can be returned in one query. If more trades exist than specified by the given or default count, a url with maxId set to the next unreturned trade will be returned within the Link header.

Currently it's not possible to get more than 50 trades since you cannot access to the Link Header returned.

[eadains]

Just through some quick searching, Requests provides an easy way to do this:
http://docs.python-requests.org/en/latest/user/advanced/#link-headers

Should be fairly easy to modify the get_trades() function to return the maxId, and perhaps accept it as a parameter. I may do it myself eventually.