Router functions
Remove unnecessary debug exports
Add a `name()` function to get item series name from items
temp
Remove backbone-relational and re-design the data flow
Append DataStore to all collections and models when initialize
Fix the `@setDataStore` method of collections
Refine the template rendering function
Modify ItemSeries Model to work under un-relational way
Use slim as default html templte
Customize .toJSON() function of itemSeriesModel