[DOC] update release notes
[TASK] bump version to 0.8.0-rc2
Merge pull request #157 from geertweening/release

Prepare 0.8.0-rc2 release
[TASK] Amount: Constants should be static fields on the class, not a separate export.
Merge pull request #158 from justmoon/amount_constants

Amount: Constants should be static fields on the class, not a separate export.
[DOC] update release notes
[TASK] bump version to 0.8.0-rc3
[TASK] add publish to bower script