fix(base): Enforce object-curly-spacing

Objects shouldn't have spaces after the opening curly or before the closing one.

BREAKING CHANGE: http://eslint.org/docs/rules/object-curly-spacing ([2])

index.js

@@ -105,6 +105,7 @@ module.exports = {
         'no-tabs': [2],
         'no-trailing-spaces': [2, {skipBlankLines: true}],
         'no-unneeded-ternary': [2],
+        'object-curly-spacing': [2],
         'object-property-newline': [2, {
             allowMultiplePropertiesPerLine: true
         }],