Added 'Read' instance for 'Sorting'
Working example:
	*Main Data.String> read "new" :: Sorting
	New
	*Main Data.String> read "Contr" :: Sorting
	Controversial
	*Main Data.String> read "unexistent_type" :: Sorting
	Hot
Implemented ability to invoke with command line arguments
>   [<subreddit>]/[new|hot|controversial|top]

Examples:
    $ hreddit haskell/neW
    > list
    haskell/New
    ===========

    $ hreddit haskell
    > list
    haskell/Hot
    ===========

    $ hreddit /
    > list
    /Hot
    ====

    $ hreddit /Cont
    > list
    /Controversial
    ==============
Fixed README and TODO files
Moved 'Read Sorting' instance to 'Network/Reddit.hs'
Relax dependencies to work with ghc-7.6.3

Relaxed dependencies for base and bytestring packages, for ghc-7.6 compatibility. bytestring-0.10.0.2 and base-4.6.0.1 are bundled with ghc-7.6.3. A `tested-with` field has also been added.
Fixed identation
Completely rewrote contex load functions. Now they are much more
readable and expandable.