2017-10: GNU Taler v0.4.0 released

We are happy to announce the release GNU Taler v0.4.0 with support for customer refunds, protocol versioning, incremental key material download, returning funds from the wallet directly back into one's bank account, and various other minor improvements. The Chrome and Chromium wallets are available for download via the App store. The exchange, merchant backend and bank components are on the GNU FTP mirrors. Note that the Firefox wallet will take a few more days to become available in the App store due to the Mozilla review process.