UI: Enable partner engineers and admins to create namespaces

[chouseknecht]

Partner engineers and admins must be able to create and manage namespaces, including adding and removing owners.

• Modify My Namespaces page to include an Add or Create feature.
• By default all new namespaces should include partner engineering as an owner.

[chouseknecht]

Requires #180

[romanblanco]

Modify My Namespaces page to include an Add or Create feature.

The feature should be labeled as Create.

[romanblanco]

working on this in romanblanco:issue180 branch