Use the new build env on Travis
Merge pull request #129 from joshk/patch-1

Use the new build env on Travis
statement_description => statement_descriptor
Merge pull request #131 from stripe/michelle-stmt-desc

statement_description => statement_descriptor
Adding APIBase to request options.
Provide ability to send multipart post requests.
Creating file upload resource.
Formatting and fixing syntax errors.
Improving upload test.
Get the file upload test file.
Better error handling for file inputs.