Possible Fix for test_dem2pts failure

[stoiver]

Duncan has been getting an error when using an environment with numpy 1.9

ERROR: test_dem2pts_bounding_box_v2 (main.Test_Dem2Pts)
Test conversion from dem in ascii format to native NetCDF format

Traceback (most recent call last):
File "test_dem2pts.py", line 92, in test_dem2pts_bounding_box_v2
verbose=False)
File "/nas/mnh/georisk_models/inundation/sandpits/dgray/anuga_core/anuga/file_conversion/dem2pts.py", line 50, in dem2pts
result = apply(_dem2pts, [name_in], kwargs)
File "/nas/mnh/georisk_models/inundation/sandpits/dgray/anuga_core/anuga/file_conversion/dem2pts.py", line 155, in _dem2pts
dem_elevation_r = num.reshape(dem_elevation, (nrows, ncols))
File "/scratch/anaconda/lib/python2.7/site-packages/numpy/core/fromnumeric.py", line 220, in reshape
return _wrapit(a, 'reshape', newshape, order=order)
File "/scratch/anaconda/lib/python2.7/site-packages/numpy/core/fromnumeric.py", line 45, in _wrapit
result = getattr(asarray(obj), method)(_args, *_kwds)
File "/scratch/anaconda/lib/python2.7/site-packages/numpy/core/numeric.py", line 462, in asarray
return array(a, dtype, copy=False, order=order)
IOError: Index exceeds dimension bound

It might have to do with dem_elevation not being a numpy array. So have removed this problem

[coveralls]

Coverage increased (+0.0%) to 65.46% when pulling 6dba074 on stoiver:master into fc38d5e on GeoscienceAustralia:master.