add quantity Integer so plans with and editable quantity will work
added mapping for "starts_at" element so "future" subscriptions can be handled accordingly
tests added for new fields
added extra intellij project files to ignore
Merge pull request #18 from patsimon/new_fields

New fields
Added bindings for collection_method, net_terms and po_number elements on Subscription for manual invoicing. Added test around these new additions
setters for collectionMethod and poNumber take an object now instead of a string to work around some of Recurly's complex XML formatting
client: extract transaction errors, pass 2

Fix exception extraction for Play/Scala.

See #16.

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
Merge remote-tracking branch 'upstream/master' into new_fields
no quantity set on  an AddOn for a plan