Results 4 issues of Tom Heslop

the `marketPnL` method might need a little work, fails to parse response if the market has close.

explore `as.data.frame` methods for the lists returned by the methods found in `betfair`

Betfair price charts are available using the marketId and selectionId, is it possible to retrieve these plot them, save them, etc? example url: `https://sportsiteexweb.betfair.com/betting/LoadRunnerInfoChartAction.do?marketId=123456789&selectionId=123456` NB. the marketId doesn't include the...

create a single [function](https://github.com/durtal/betfaiR/blob/03ce8fd6c99afb853208fe311f95911c98119825/R/collect_data.R) which could be used to help periodically collect betfair market data, similar to the process found in [vignette two](http://durtal.github.io/betfaiR/vignette_two.html)