Adding Travis CI setup file.
Update README.md
Update README.md
exercise changes
Fix for #1636: select thumbnail format from a list instead of hard-coding to png.
Template changes to toggle behavior based on whether a thumbnail is available.
Make travis show stack trace on any fatal error.
Merge pull request #1873 from bcipolli/1636

Fix for #1636: select thumbnail format from a list instead of hard-coding to png.
Update version; remove .travis.yml in master branch.
Fix for #1903: metadata check was wrong, outer loop should be model dependencies.

Conflicts:
	kalite/securesync/devices/models.py
Merge pull request #1909 from bcipolli/1903

Hotfix for #1903: metadata check was wrong, outer loop should be model dependencies
Moving remaining code from outer into inner loop.
some commits
Update ReadMe to reflect transition to GH wiki.
Merge branch 'master' of github.com:learningequality/ka-lite into mjp_release-0.11
new exercises
picture files