add optional parameters to transaction listing to enable paging, etc
add destinationId & destinationType to funding source listing to filter funding sources by destination
added example usage of new funding sources & transactions filtering
use settings defined in example (removed it while testing)
Merge pull request #1 from jareddellitt/master

Add optional parameters to funding sources & transactions listing
Update CHANGELOG to reflect contributions by Jared
Merge branch 'master' into dwolla-scala-sdk-2.0.0