Changed as many urls to be url_for()
Merge pull request #54 from orvsd/url_for

Change hardcoded links to url_for()
Linked ORVSD Central logo to '/'
Used url_for() to link OC logo
Merge pull request #51 from orvsd/link_OC_logo

Linked ORVSD Central logo to '/'
test base: handle app context
Merge pull request #59 from orvsd/base_test_app_context

test base: handle app context
Fixed serialization error for install_course task.