added states resource

closes #58
added inline address for checks and bank_accounts
Merge pull request #62 from bsiddiqui/checks-banks-inline-address

added inline address for checks and bank_accounts
Merge pull request #61 from bsiddiqui/add-state-resource

added states resource
bumped version to 1.6
change all asset URLs to use lob-assets bucket
Merge pull request #64 from bsiddiqui/update-asset-url

change all asset URLs to use lob-assets bucket
bump version to 1.7
Merge pull request #65 from bsiddiqui/update-asset-url

bump version to 1.7