Draft: Added a new webservice: get_course

get_course returns a complex object containing all the info
on the course. This allows the mobile app to receive an overview
of the course with a single request.

Input:
- courseid
- lastacces -> timestamp of the last user access
- timestart -> calendar timestamp start
- timened -> calendar timestamp end

Output - json object:

{
    users: [],
    groups: [],
    groupings: [],
    grades: [],
    grade_items: [],
    course_sections: [],
    course_modules: [],
    forum_discussions: [],
    forum_posts: [],
    folders: [],
    resources: [],
    choices: [],
    url: [],
    pages: [],
    books: [],
    recent_activity: [],
    calendar_events: []
}