Merge pull request #14 from ChadBurggraf/master

Add account_balance to update customer request.
updated nuspec
added cards api and updated tokens api
Added application_fee to CreateChargeWithToken

this is necessary when using stripe connect and wanting to take a cut
out of the total charge.
changed formatting to match
Merge pull request #16 from JamesReate/master

Added application_fee to CreateChargeWithToken
Merge remote-tracking branch 'origin/master'