update circle to install readthedocs sphinx extension

Author: satra

circle.yml

@@ -28,6 +28,7 @@ dependencies:
     - pip install -e git+https://github.com/enthought/blockcanvas.git#egg=blockcanvas
     - pip install -e git+https://github.com/enthought/etsproxy.git#egg=etsproxy
     - pip install -e git+https://github.com/enthought/ets.git#egg=ets
+    - pip install https://github.com/rtfd/readthedocs-sphinx-ext/archive/master.zip
     - gem install fakes3
     - if [[ ! -d ~/examples/data ]]; then wget "https://dl.dropbox.com/s/jzgq2nupxyz36bp/nipype-tutorial.tar.bz2" && tar jxvf nipype-tutorial.tar.bz2 && mv nipype-tutorial/* ~/examples/; fi
     - if [[ ! -d ~/examples/fsl_course_data ]]; then wget -c "http://fsl.fmrib.ox.ac.uk/fslcourse/fdt1.tar.gz" && wget -c "http://fsl.fmrib.ox.ac.uk/fslcourse/fdt2.tar.gz" && wget -c "http://fsl.fmrib.ox.ac.uk/fslcourse/tbss.tar.gz" && mkdir ~/examples/fsl_course_data && tar zxvf fdt1.tar.gz -C ~/examples/fsl_course_data && tar zxvf fdt2.tar.gz -C ~/examples/fsl_course_data && tar zxvf tbss.tar.gz -C ~/examples/fsl_course_data; fi