Removed gauges and regions sections from setrun.py for 3d examples -- not yet implemented
add num_dim as argument to RegionData and GaugeData to print error if num_dim==3...
Also need changes in clawpack/clawutil commit 263ad7415f3 to have num_dim passed in.
Need to modify visclaw eventually to pass in num_dim.
For now default is 2 to avoid needing to pass it in.
Merge pull request #82 from rjleveque/rm_3d_gauges_regions

Removed gauges and regions sections from setrun.py for 3d examples