Print out Montage warnings
Print out Montage warnings

git-svn-id: ad2bc5b4c923da2fa30b511c20f38714e11ea5d6@3 cf66f5ca-ee26-4772-92ff-0de9cccd0768

vterron/montage-wrapper,astrofrog/montage-wrapper,astrofrog/python-montage,astropy/montage-wrapper,jat255/montage-wrapper,astrofrog/montage-wrapper