ENH: Include low res CIFTI templates in Docker image

[mgxd]

Closes #1995

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[effigies]

Templateflow still needed to fetch a file:

200225-20:19:20,700 nipype.workflow INFO:
	 [Node] Running "gen_cifti" ("niworkflows.interfaces.cifti.GenerateCifti")
Downloading https://templateflow.s3.amazonaws.com/tpl-MNI152NLin6Asym/tpl-MNI152NLin6Asym_res-02_atlas-HCP_dseg.nii.gz

  0% 0.00/25.0 [00:00<?, ?B/s]
26.0B [00:00, 1.04kB/s]