Copy groups_file usage instructions from wiki (PR #346)
Add nohup to OpenWrt requirements
updates
irc contact
Merge remote-tracking branch 'upstream/master' into chinese

Conflicts:
	html/templates/contribute/index.html.ep
	html/templates/get/index.html.ep
	html/templates/howtos/groups_file.html.ep
	html/templates/howtos/openwrt.html.ep
	html/website.pl