Linter update (#1777)

* Update eslint config

* Applied linter to lib

* Applied eslint config to CliClient/app

* Removed prettier due to https://github.com/prettier/prettier/pull/4765

* First pass on test units

* Applied linter config to test units

* Applied eslint config to clipper

* Applied to plugin dir

* Applied to root of ElectronClient

* Applied on RN root

* Applied on CLI root

* Applied on Clipper root

* Applied config to tools

* test hook

* test hook

* test hook

* Added pre-commit hook

* Applied rule no-trailing-spaces

* Make sure root packages are installed when installing sub-dir

* Added doc

ReactNativeClient/lib/renderers/MdToHtml/rules/checkbox.js

@@ -1,8 +1,3 @@
-const Entities = require('html-entities').AllHtmlEntities;
-const htmlentities = new Entities().encode;
-const Resource = require('lib/models/Resource.js');
-const utils = require('../../utils');
-
 let checkboxIndex_ = -1;
 
 const checkboxStyle = `