Override Logger#<< to always append with formatting and level.

--HG--
extra : amend_source : d82d758ec371efef6932354a4e46ce1c47e8e722
Bump minor version, update history.
Added signature for changeset 7e7b1c51eb3e
Added tag v0.7.0 for changeset d0325195530a
Update specs to use new RSpec syntax.

- Split out LogHost and LogClient mixins into their own files
- Added generated gemspec and Gemfile
- Dropped support for Ruby < 1.9.3.
Add mechanism for temporary aggregated overrides