#567

* feat(checkbox-group): add a col configuration

* feat(radio): add a col configuration

* chore(demo): add a col configuration to checkbox-group and radio

* docs(radio): add a col configuration to radio

* docs(checkbox-group): add a col configuration to checkbox-group

* fix: forceUpdate

* fix: rename

* fix: indexList foceUpdate

nextTick is faster than events

* feat(scroll): add pullUpLoad subprops visible

* feat(scroll): enhance forceUpdate

* chore(scroll): update docs and test

* optimise(scroll): using nextElementSubling

* chore(docs): update scroll doc

* chore(unit): update unit test to improve coverage

* chore: fix scroll docs

* feat(checker): new component checker

* test(checker): init checker test

* refactor(demo): add checker

* docs(checker): init checker docs

* refactor(checker): remove console

* test(checker): fix radio test

* fix(checker): radio & checkbox type active condition

* fix(checker): radio condition error

* refactor(example): checker router component path err

* test(checker): fix test

* add checker disabled

* add checker disabled document

* 修改checker文档

* 修改缩进

* 修改test

when inner element can't scroll

* feat(date-picker): add columnOrder prop

add columnOrder prop which can be used to change the display order in case where the order is not
'Year-Month-Day Hour-Minute-Second'

* docs(date-picker): add version for columnOrder

* docs(date-picker): fix the mistake in document of date-picker

change "Day" to "Date" in the expression of columnOrder prop

#427

* fix(slide): fix maxScrollX/Y caculating error in nested Slide

* optimise

* docs(recycle-list): add clean methods

* feat(recycle-list): add clean methods

* test(recycle-list): test clean methods

* docs(recycle-list): change clean to reset

* feat(recycle-list): change clean method to reset method

* test(recycle-list): test list length of recycle-list

* test(recycle-list): optimize unit case

* fix(recycle-list): fix stop scroll bug

* docs(recycle-list): optimize docs

* fix(recycle-list): improve coverage

* test(recycle-list): add some test suites

* fix(recycle-list): normalize function name

* refactor(recycle-list): change ele class

* fix(recycle-list): set list vari to normal prop

* fix(recycle-list): hide loading-spinner when stop scroll

* fix(recycle-list): remove stopFetch variable

* test(recycle-list): modify unit case

* fix(recycle-list): clean unused whitespace and ajust position of noMore

* fix(recycle-list): make noMore var reactive

* fix(slide): goToPage direction

* fix: remove default time value in goToPage function

#286

* feat: max

* test(time-picker): max example

* fix(time-picker): days.len

* docs: max

* fix(time-picker): column init

* test(time-picker): max

* docs: max

* test: fix minute step

* fix: potential float bug

* feat(time-picker): min

* test(time-picker): min

* docs(time-picker): min

* docs(time-picker): min, max