Update default academic year to 2014/2015 sem 1

Main changes are in `helpers/normalize_modules_json.js` due to the
change in format of the modules.json from NUSMods API. These include:

- Preserving the keys that we require. After all, this is just a
  slightly incomplete version of NUSMods 1.0
- Putting in a placeholder value for modules without Exam Dates
- Standardizing the values of the `DayText` and `LessonType` keys to
  uppercase
- Correctly handle the `WeekText` key

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
index.html - remove line saying many features coming soon

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>