Merge pull request #2682 from edx/frances/experiments/rtl

.gitignore

cms/envs/common.py

cms/static/sass/_base.scss

cms/static/sass/elements/_controls.scss

cms/static/sass/elements/_header.scss

cms/static/sass/elements/_icons.scss

cms/static/sass/elements/_layout.scss

cms/static/sass/elements/_modules.scss

cms/static/sass/elements/_navigation.scss

cms/static/sass/elements/_sock.scss

cms/static/sass/elements/_system-feedback.scss

cms/static/sass/elements/_system-help.scss

cms/static/sass/elements/_xblocks.scss

cms/static/sass/style-app-extend1-rtl.scss

cms/static/sass/style-app-extend1.scss

cms/static/sass/style-app-rtl.scss

cms/static/sass/style-app.scss

cms/static/sass/style-xmodule-rtl.scss

cms/static/sass/style-xmodule.scss

cms/static/sass/vendor/bi-app/_bi-app-ltr.scss