新增 Ajax loading 時的動畫效果
ajax_core.js:
    add ajaxAnimation
js/CourseSelectionCore.js hasn't been completed
新增 ajax 動畫圖(loading.gif)
首頁的 calendar
Checkpoint.
Change the data structure of the calendar events.
Still under development...
Object CoursesAgenda and CoursesCalendar have been completed.
Start Testing jsRefactorTester
測試中
course_picker.php:
    make (window).load() comment
Still testing...
Modified lots of code in js/CourseSelectionCore.js. Add some object about calendar.
衝堂問題尚未解決
尚未解決：刪除後顯示問題，衝堂時顯示問題
Almost there...
Test completed. It seems there is no big bug now.
Change enroll buttons event from mouseover to mouseenter.
It make the calendar work fine on Firfox and Chrome.
Fix the enroll button event bug(In Chrome, click the button center would make detail pop out.).
修正部分外觀，縮減 navbar 大小，去除文字陰影。
The first refactoring done. Checkpoint.
Merge branch 'jsRefactor'