refactor network.php, rewrite test/test_networl.php
refactor time.php, rewrite test case
end function comment.
refactor time.php
change function week and month default return type.
update construct in EventTime and LessonTime, update test case.
update comment
setWkRepeatTrueforThisWk function bugfixed.
rewrite Course.Class.php, rewrite Lesson Class.
finish setWkRepeat function, create a better test case. close issue#3.
create a course with 2. course details(manual mode).
getInstanceWithCodeIndexAndInfo method finished. close #4.
Use getInstanceAuto instead of getInstanceWithCodeIndexAndInfo
finish Course.Class.php. close #2, close #5, fix #6
delete comment codes :(
lesson summary added.
lesson description added.
works with wrong url.
Course addErrorFlag method added.
rewrite createCal function. close #7