Adds coffeelint.json to the .gitignore.

- Lets users override default coffeelint settings for vim-mode.
- For example can change their default from 4 to 2 spaces.
Remove calls to removed EditorView::edit method

This removes editor view caching since it is no longer supported in
in the new editor view.

The new react editor view should be faster to load though and the
spec time still seems pretty low.

Closes #393
Merge pull request #398 from DavidLGoldberg/add_coffeelint_gitignore

Adds coffeelint.json to the .gitignore.
Better behavior for l (move right) with folding.