Added numpy ufunc support and changed testing to nose.

pyramid/fielddata.py

pyramid/phasemap.py

pyramid/tests/test_analytic.py

pyramid/tests/test_costfunction.py

pyramid/tests/test_dataset.py

pyramid/tests/test_fielddata.py

pyramid/tests/test_forwardmodel.py

pyramid/tests/test_kernel.py

pyramid/tests/test_magcreator.py

pyramid/tests/test_phasemap.py

pyramid/tests/test_phasemapper.py

pyramid/tests/test_projector.py

pyramid/tests/test_regularisator.py

setup.py