Add support for V5 add-ons which are in SWSIM V35.

This also fixes an issue with parsing prohibited_with_any_of attribute
on AddOn when returned from GetRates call.
Remove recipient_email and memo :from option names.

The :from in these cases is not necessary and causes an infinite loop
when being parsed.
Merge pull request #21 from freerunningtech/add-v5-add-ons

Add support for V5 add-ons which are in SWSIM V35.
Merge pull request #22 from freerunningtech/fix-from-options

Remove recipient_email and memo :from option names.
Version bump.