Added the ability to lookup generic items with client, rather than the currently supported folder and file
rolling version.
updated gemspec.
Merge pull request #56 from attachmentsme/client-lookup-by-item

Allow Lookup By Generic client.item, rather than just client.folder, or client.file
Box exceptions now maintain the original body and status. see #57.
Update README.markdown

folder.shared_link[:url] -> folder.shared_link.url
Merge pull request #59 from ombr/patch-1

Update README.markdown
small update to README.md