Cumulusci

- Fix issue in getting latest version

- Initial Integration with Robot Framework (see here for details:
<http://cumulusci.readthedocs.io/en/latest/robotframework.html>)
- Add support for GlobalValueSetTranslation Metadata Type (thanks
Christian Szandor Knapp!)
- Use Tooling API for PackageUploadRequest
- New doc "Why CumulusCI?"
- Add documentation for the skip option on GitHub dependencies

- Support bigobject index element in .object
- Only run meta.xml file cleaning on classes/\* and triggers/\*
directory
- Add docs on CumulusCI Flow
- Add reference to needing the Push API to run release_beta in
tutorial doc

- Add new Status 'Queued' to PackageUploadRequest check

- Add a sleep in between successful PackageUploadRequest and querying
for MetadataPackageVersion to address issue in Spring '18 packaging
orgs.

- Update salesforce-bulk package to version 2.0.0
- Fix issue in bulk load data task