Different input/output options

[jpmckinney]

Based on demand, we can consider adding URL input (instead of upload only), and the option to output to Google Drive. Proposed by @robredpath at OCDS Retreat.

[aguilerapy]

For #67 to work it's necessary to create credentials for the Google Drive API with an OCP account. Here we have a guide.

Then just configure the environment variable: OCDS_TOUCAN_CREDENTIALS_DRIVE in settings.py to point to a JSON file that contains the credentials.

[jpmckinney]

The guide is for Adwords, so our use is a little different.

My main steps were:

1. Create new project
2. Enable Google Drive API
3. Setup consent screen with the drive.file scope
4. Create credentials
5. Submit for verification

Now waiting on verification.

[aguilerapy]

Both options are merged and deployed (URL and Google Drive).