Merge branch 'release/1.3' into develop
Add update_user function to support serialization of user updates

Fixes #8

RiakCS user updates need to be serialized through stanchion. Expose a
function in the velvet client to support this.
Update lager dependency to 2.0.0 tag
Merge branch 'feature/update-user-function' into develop
Update lager to 2.0.1
Merge pull request #14 from basho/bugfix/update-lager-to-2.0.1

Update lager to 2.0.1
Merge branch 'release/1.4'