Doc theme

4 jobs for master in 2 minutes and 28 seconds (queued for 44 seconds)
Name Stage Failure
failed
doc Test
creating /builds/dev/scikit-multimodallearn/build/sphinx
creating /builds/dev/scikit-multimodallearn/build/sphinx/doctrees
creating /builds/dev/scikit-multimodallearn/build/sphinx/html
Running Sphinx v1.6.7

Extension error:
Could not import extension sphinx_rtd_theme (exception: No module named 'sphinx_rtd_theme')
Cleaning up file based variables
ERROR: Job failed: exit code 1