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/alert.js

@@ -35,7 +35,7 @@ define(['browser', 'dialog', 'globalize'], function (browser, dialog, globalize)
                 if (result === 'ok') {
                     return Promise.resolve();
                 }
-    
+
                 return Promise.reject();
             });
         }