README.rst: Travis-ci build status image.

RST, not Markdown [ci skip].
README.rst: Travis-ci build status image info.

[ci skip]
Merge branch 'master' of github.com:devilry/devilry-django
devilry_qualifiesforexam...app: Made plugin model and store.
devilry_qualifiesforexam...app: Rename frontpage to selectplugin.
devilry_qualifiesforexam...app: Separate view dir for selectplugin.
devilry_qualifiesforexam...app: UI to select plugin.
devilry_qualifiesforexam...app: Cleanup.