Adds func to get day's list with first day to monday
Adds func to get day's list with first day to monday

- Add `dayList()` function to directly get day list but with a new
option to get first day to Monday (instead of Sunday)
- Fixes indexes day list's (starting from 1 instead of 0)
- Update of `dateList()` code to use `dayList()` function

maxlord/yii2-helpers