Add configuration to have sidebar items in navbar

Added $wgStrappingSkinSidebarItemsInNavbar, with a default to show
the print/export menu in the navbar.

Change-Id: Ie35b0dc431b5747ce15f434d93b075c1a03b5b27
Add missing config

Change-Id: Ic191614f31812a5389a0017e02c45c8a8c545878
Fix sidebar exclusion

Change-Id: I127058e2195a0c25d29b88c0b8b178c1af26f4cd
Merge pull request #12 from ryan-lane/sidebarnav

Sidebar nav