Changed `fiddle` to an entity and removed unneeded fiddle reducer.
Added a selector for getting the entity.
Changed fiddle saga to `doRequest`.
Changed fiddle api call to the `post` method (did not see beofre the rebase).
Added `CompilerError` presentation component to handle displaying compiler errors and warnings.
Added spaces to css (as requested).
Removed extra space after function in solidity compiler (as requested).
Removed the compile contract event from the solidity compiler (as requested).
Handling of fatal api error in the UI.
Changed fiddle action to the one created with `createRequestTypes`.
Moved `Fiddle` nav tab before `Documentation`.
Changed `FiddleResults` DOM manipulation to be controlled via React state instead.