Enable tests modules to auto-import all test files in their directories.
updating error logic in coach reports; adding tests to verify if-then-else logic.
better documentation and code structure, based on self-code review
cleaning missing topics.  Hard problem
fixing bug in looping over children, recovered one missing child.
Merge branch 'coach_reports_error_message' into empty_subtopics_1
add tests for checking that knowledge map elements are on the page (though does not confirm that they are visible.
Merge remote-tracking branch 'upstream/develop' into empty_subtopics_1
fixing up error messages.
Merge pull request #437 from bcipolli/coach_reports_error_message

Coach reports error message
Merge branch 'release-0.10' of github.com:learningequality/ka-lite into testing_testing

Conflicts:
	kalite/central/tests/__init__.py
	kalite/main/tests/__init__.py
	kalite/securesync/tests/__init__.py
Added a helper function for importing * from all modules in a directory.
Tweaks to auto-import function.
Tweak to docstring for import_all_from function.
Removed "exclude_special_modules" param from "import_all_from".
Merge branch 'empty_subtopics_1' of git://github.com/bcipolli/ka-lite into bcipolli-empty_subtopics_1

Conflicts:
	kalite/main/tests/__init__.py
Merge branch 'testing_testing' into release-0.10
Merge branch 'release-0.10' of github.com:learningequality/ka-lite into release-0.10

Conflicts:
	kalite/main/tests/__init__.py