open facebook page using facebook app if installed

This will make the Facebook link #98 open in the Facebook app if it is installed. In order for this to work Atlanta's Facebook URL needs to be changed to its long form: https://www.facebook.com/pages/ObaAtlanta/136662306506627 in the [server directory](https://docs.google.com/spreadsheet/ccc?key=0AsoU647elPShdHlYc0RJbkEtZnVvTW11WE5NbHNiMXc#gid=0).

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