Merge pull request #1145 from wp-cli/suppress-update-errors

Error notices when using `wp widget add`
Merge pull request #1180 from szepeviktor/patch-2

don't set user when installing
Functional tests for #1180
Merge pull request #1182 from wp-cli/fix-parent-id-1182

wp menu item add-post --parent-id=ID does not set menu item parent id
Merge pull request #1126 from wp-cli/fix-undefined-error-ngettext

Use the WP _n instead of ngettext function