Add automation for easily defining kernels

The module IHaskell.IPython.EasyKernel provides automation for writing
simple IPython kernels. In particular, it provides a record type that
defines configurations and a function that interprets a configuration as
an action in some monad that can do IO.

The configuration consists primarily of functions that implement the
various features of a kernel, such as running code, looking up
documentation, and performing completion. An example for a simple
language that nevertheless has side effects, global state, and timing
effects is included in the examples directory in a file called Calc.hs.

Presently, there is no automation for creating the profile in the
.ipython directory. One should follow the IPython instructions for this.

Add IHaskell.Display.IHaskellDisplay instance for DecsQ

Permit use of inline template haskell

See comments at https://github.com/gibiansky/IHaskell/pull/330

issue: https://github.com/gibiansky/IHaskell/issues/236

To verify functionality, paste the following into a code block in
IHaskell.

```
:ext TemplateHaskell
import Language.Haskell.TH
import Control.Lens
data Foo a = Foo { _bar :: Int, _baz :: Int, _quux :: a }
makeLenses ''Foo
:ty baz
```

fix test

Updating Docker Documentation

homebrew haskell platform deprecated

Brew says: 
```
$ brew install haskell-platform
Error: No available formula for haskell-platform
We no longer package haskell-platform. Consider installing ghc
and cabal-install instead:
  brew install ghc cabal-install

A binary installer is available:
  https://www.haskell.org/platform/mac.html
```

Implement pragma handling

Add missing dependency

Various upper bound bumps