added city slug as id to city list item, to be used so that city pages display their menu item as highlighted
added city slug as id to city list item, to be used so that city pages display their menu item as highlighted

ilikepi/openhack.github.com,twinn/openhack.github.com,geopet/openhack.github.com,OpenHack/openhack.github.com,OpenHack/openhack.github.com,NeftaliYagua/openhackve.github.io-bk,robdudley/openhack.github.com,twinn/openhack.github.com,10to1/openhack.github.com,dideler/openhack.github.com,OpenHack/openhack.github.com,ilikepi/openhack.github.com,robdudley/openhack.github.com,dideler/openhack.github.com,imrehg/openhacktest,geopet/openhack.github.com,ridingwolf/openhack.github.com,NeftaliYagua/openhackve.github.io-bk,ridingwolf/openhack.github.com,10to1/openhack.github.com,NeftaliYagua/openhackve.github.io-bk,ridingwolf/openhack.github.com,ilikepi/openhack.github.com,clone1018/openhack.github.com,dideler/openhack.github.com,imrehg/openhacktest,twinn/openhack.github.com,clone1018/openhack.github.com,clone1018/openhack.github.com,robdudley/openhack.github.com,geopet/openhack.github.com