Start work on non-scalar tensor types

[dschwen]

Refs #20

[moosebuild]

Job Precheck, step Clang format on f5ac896 wanted to post the following:

Your code requires style changes.

A patch was auto generated and copied here
You can directly apply the patch by running, in the top level of your repository:

curl -s https://mooseframework.inl.gov/swift/docs/PRs/21/clang_format/style.patch | git apply -v

Alternatively, with your repository up to date and in the top level of your repository:

git clang-format 5c24bc5657be29d272545f702ce699cbbe117ccd

[dschwen]

Superseded by #26