a. refactoring ( x )
		i. seperate javascript code from view( x   ---can't separate decrement() )
		iii. remove unused files  ( x )
	b. specify "Rental Listing"  (x)
	c. alphabetic order (x)
	f. add a header ( x  )
	i. remove "custom" option (x)
	h. apply boostrap to pages (  x )
	m. unify url setting ( x )