picture saving added to camera example  (#4842)
picture saving added to camera example  (#4842)

* camera click_pic added

* date formate corrected

* function name changed

* func name changed

* pep8 fixes

* pep8 fix

manthansharma/kivy,inclement/kivy,kivy/kivy,tony/kivy,rnixx/kivy,manthansharma/kivy,jkankiewicz/kivy,autosportlabs/kivy,kived/kivy,LogicalDash/kivy,LogicalDash/kivy,matham/kivy,matham/kivy,jegger/kivy,KeyWeeUsr/kivy,kivy/kivy,kivy/kivy,matham/kivy,bionoid/kivy,akshayaurora/kivy,rafalo1333/kivy,rafalo1333/kivy,LogicalDash/kivy,janssen/kivy,bionoid/kivy,rnixx/kivy,manthansharma/kivy,rnixx/kivy,bionoid/kivy,KeyWeeUsr/kivy,matham/kivy,tony/kivy,kived/kivy,janssen/kivy,jkankiewicz/kivy,Cheaterman/kivy,KeyWeeUsr/kivy,jegger/kivy,KeyWeeUsr/kivy,kived/kivy,janssen/kivy,inclement/kivy,janssen/kivy,manthansharma/kivy,LogicalDash/kivy,inclement/kivy,rafalo1333/kivy,jkankiewicz/kivy,autosportlabs/kivy,jegger/kivy,Cheaterman/kivy,jegger/kivy,Cheaterman/kivy,bionoid/kivy,autosportlabs/kivy,tony/kivy,akshayaurora/kivy,akshayaurora/kivy,jkankiewicz/kivy,Cheaterman/kivy