Implements the enable all plugins function.
fix `wp comment approve` and `wp comment unapprove` commands
make sure comment approve and unapprove are changing comment status
Merge pull request #1444 from rodrigoprimo/fix-comment-set-status

Fix `wp comment approve` and `wp comment unapprove` commands
Fixed mkdir command in `wp core download` on Windows
Don't iterate when there aren't image sizes
Merge pull request #1457 from borekb/issue-1456

Fixed mkdir command in `wp core download` on Windows
Merge pull request #1461 from wp-cli/fix-1459

Don't iterate when there aren't image sizes
Merge remote-tracking branch 'tiagohillebrandt/master' into enable-all-plugins
add tests to `wp plugin activate --all` and `wp plugin deactivate --all`
Merge pull request #1467 from rodrigoprimo/enable-all-plugins

Add --all param to `wp plugin activate`
Merge remote-tracking branch 'upstream/master' into remove-unused-variables

Conflicts:
	php/commands/media.php