Convert some functions' scope to inner

Convert some functions' scope to inner
Fixed bugs in MonthView,Calendar,RangeCalendar

Fixed bugs in MonthView,Calendar,RangeCalendar
Added setRange interface for them
Changed value format from ‘yyyyMMdd' to 'yyyy-MM-dd'
Added disable and readOnly handle for single mode

Added disable and readOnly handle for single mode
Merge branch 'master' of https://github.com/ecomfe/esui