Added "rake clear:cache" task that uses Observist.
Added "rake clear:cache" task that uses Observist.

osbridge/openconferenceware,mynameisfashanu/openconferenceware,osbridge/openconferenceware,osbridge/openconferenceware,osbridge/openconferenceware,mynameisfashanu/openconferenceware,mynameisfashanu/openconferenceware,ondrocks/openconferenceware,mynameisfashanu/openconferenceware,ondrocks/openconferenceware,ondrocks/openconferenceware,ondrocks/openconferenceware