added User, Habit, Daily and Todo classes with most essential fields
Moved setters to public scope.

why so protected?
- Added a virtual type() method to Task class

- Added 'notes' and 'redness' members to Task class
- Renamed bool getters to is'ers
- Renamed Task's member 'text' to 'name'
JSON constructors are now receiving const refs. Health is a double.
Merge pull request #1 from moskupols/habit-data

Habit data