Release v0.2.0

The main update in this release is the switch from saving the B2 authentication token in an Rds file, to using environment variables, as outlined in the R API packages best practices guidelines.

Other minor issues, such as typos in the Authors field of the DESCRIPTION file, have been addressed.

All new backblazer builds are now automatically submitted to Travis CI for testing.

Releave v0.1

First release of backblazer package, R bindings to the Backblaz B2 API.