Make toggle-sidebar action enabled

No idea why it has been disabled so far

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Use success param in Browser._downloadDone

It has been named "status", but "success" is more distinct
from other params "statusCode" and "statusText".

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add doc to Nuvola.Browser

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add doc for Nuvola.MediaKey(s)

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add doc to Nuvola.MenuBar

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add doc to Nuvola.WebApp

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add examples of actions to Nuvola.Actions

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Squash paragraphs in Nuvola.{$prototype,$object}

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>