Exclude additional files/folders from zip_kalite bundling.
Wording tweaks in comments.
Merge branch 'release-0.11' of github.com:learningequality/ka-lite into 999
Docstring correction on get_topic_leaves.
Tweaked slug_blacklist to include NASA/Lebron, and exclude Hour of Code.
Exclude _khanload_cache from zipping as a directory, not a file.
Merge pull request #1133 from jamalex/999

Tweaks to khanload to include more partner content, and exclude Hour of Code, plus some wording/cleanup.
Merge branch 'i18n_command_tweaks' of github.com:bcipolli/ka-lite into HEAD
added a few more lanugages to the language lookup

Signed-off-by: Dylan Barth <dylan.j.barth@gmail.com>
[merge UI, since underlying code that was to avoid was merged.] Merge branch 'release-0.11' of github.com:learningequality/ka-lite into release-0.11.1