Use new session views

The following replacements have been made:
* New design document name
    - New view name: (conditions) keys => values
        * Full old view name: (conditions) keys => values

* session/
    - by_courseid: (courseId && sessionType != 'public_pool') courseId => _rev (include_docs)
        * session/by_courseid: (courseId && sessionType != 'public_pool') courseId => doc
    - by_keyword: keyword => _rev (include_docs)
        * session/by_keyword => doc
    - by_lastactivity_for_guests: (sessionType != 'public_pool' && creator.indexOf('Guest') == 0) lastOwnerActivity || creationTime => _rev
        * session/by_last_activity_for_guests: (sessionType != 'public_pool' && creator.indexOf('Guest') == 0) lastOwnerActivity || creationTime => _rev
    - partial_by_ppsubject_name_for_publicpool: (sessionType == 'public_pool') ppSubject, name => partial doc
        * session/public_pool_by_subject: (sessionType == 'public_pool') ppSubject, name => partial doc
    - partial_by_sessiontype_creator_name: sessionType, creator, name => partial doc
        * session/by_creator: (sessionType != 'public_pool') creator, name => partial doc
        * session/public_pool_by_creator: (sessionType == 'public_pool') creator, name => partial doc

The following views have been removed:
* session/by_id: _id => doc (use all_docs)