Arrange js library: IE9.js

[mingtsay]

Pages using this library:

• /events/app-dev-party/index.shtml - Line 18
• /events/code-rush/index.shtml - Line 19
• /events/index.shtml - Line 16
• /events/sopa/index.shtml - Line 14

Library in the repository:

• /events/app-dev-party/assets/IE9.js
• /events/code-rush/assets/IE9.js
• /events/moztw-lab/assets/IE9.js
• /events/sopa/assets/IE9.js
• /js/library/IE9.js

[mingtsay]

also solve #188 with this issue