Add some linting rules for the CI (#587)

* enable one-var rule

* enable indent rule

* enable no-multiple-empty-lines rule

* enable no-empty rule

* enable no-trailing-spaces rule

* enable no-extra-semi rule

* add eslint rules to fix block spacing

* enable max-statements-per-line rule

* enable brace-style rule

* fix some spacing issues and add future rules

* add code suggestions

src/components/multiselect/multiselect.js

@@ -241,8 +241,6 @@ define(['browser', 'appStorage', 'apphost', 'loading', 'connectionManager', 'glo
                 id: 'refresh'
             });
 
-
-
             require(['actionsheet'], function (actionsheet) {
                 actionsheet.show({
                     items: menuItems,