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-# Accessor
-
-After trying very hard, I have to admit that my mind is too weak to understand lens. So I decided to roll my own data access library with no fancy categories but only getters, setters and fmaps chained together. 
-
-To get started:
-
-    import Accessor
-
-An accessor is a getter with a setter.
-
-For record fields, the accessors are defined as follows:
-
-    data Point = Point {_x :: Int, _y :: Int}
-    
-    x = accessor _x (\elem record -> record {x = elem})
-    y = accessor _y (\elem record -> record {y = elem})
-
-With an accessor, you can view, set, and transform data of the record:
-
-    point = Point 1 2
-    view x point -- 1
-    set x 3 point -- Point 3 2
-    over x (+1) point -- Point 2 2
-
-For a nested record, accessors can be composed using `(#)`:
-
-    data Line = Line {_start :: Point, _end :: Point}
-    start = accessor _start (\elem record -> record {_start = elem})
-    end = accessor _end (\elem record -> record {_end = elem})
-    
-
-    data Point = Point {_x :: Int, _y :: Int}
-    x = accessor _x (\elem record -> record {_x = elem})
-    y = accessor _y (\elem record -> record {_y = elem})
-
-    line = Line (Point 1 2) (Point 3 4)
-
-    start_x = view (start # x) line -- 1
-    end_y = view (end # y) line -- 4
-
-If the field is a functor, the accessor should be composed with the next accessor using `(#>)`. For example:
-
-    data Person = Person {_name :: String, _addr :: Maybe Address }
-    name = accessor _name (\elem record -> record {_name = elem}) 
-    addr= accessor _addr (\elem record -> record {_addr = elem}) 
-
-    data Address = Address {_detail :: String, _code :: String }
-    detail = accessor _detail (\elem record -> record {_detail = elem}) 
-    code = accessor _code (\elem record -> record {_code = elem}) 
-
-Let there be Alice living in Shanghai:
-
-    alice = Person
-      { _name = "Alice"
-      , _addr = Just Address
-        { _detail = "Shanghai"
-        , _code = "200000"
-        }
-      }
-
-You can view/modify Alice's address detail:
-
-    s = view (addr #> detail) alice -- Just "Shanghai"
-
-The use of `fmap` inside of `(#>)` ensures that `Nothing` is handled properly.
-
-Accessor of the nth element of a list is `listAt n`, and for 0 to 9, there are shortcuts: `_0` to `_9`.
-
-    view _1 [1,2,3] -- 2
-    view (_1 # _1) [[1,2,3], [4,5,6]] -- 5
-    set _0 42 [1,2,3] -- [42,2,3]
-    over _1 (+1) [1,2,3] -- [1,3,3]
-
-Lists are also functors, so you can `fmap` over it using `(#>)`, which is the same as `map`:
-
-    over (self #> self) (+1) [1,2,3] -- [2,3,4]
-    over (_1 #> self) (+1) [[1,2], [3,4]] -- [[1,2],[4,5]]
-
-