v0.9.0

This release of confd includes the following:

• added backend support for Redis
• added --log-level flag
• added scripts for building, testing and installing confd
• added MAINTAINERS and CONTRIBUTING files to help newer contributors
• improved test coverage on travis, including integration tests
• numerous bug fixes to etcd's --watch flag

Note that this release deprecates the following flags in favour of --log-level:

• --debug
• --quiet
• --verbose

Please see CHANGELOG for more information.