[TriLUG] new installfest map and directions

[Justin Johnson]

> 2)  As you approach the NC State campus, look for the DH Hill library on
> the left -- the 9-story building with large, shorter wings on either
> side.  It's the tallest building and fairly close to Hillsborough.

Er, look for the library on the RIGHT side of the road coming from the
Beltline on Hillsborough St. (which is the direction of travel applicable to
these directions).