[Update] Create new Basketball event

Changes:
- Deleted unnecessary files from the folder
- Changed some file extensions such as CoffeeScript to JavaScript due to
familiarity
- Changed database schema 3 times due to change of plan
- Added a hack to solve concatenation of two string fields (date +
time), stored them as separate fields in DB but time still contains a
default year which is dangerous..
- Added comments to explain changes
- Controller strong parameters changed, used to have it as attr_accessor
in model

- Planned change : Add a table for pre-existing teams, change textbox
into dropdown box for team select