Fixed lib paths in mesh and integrator tests

Author: davidcortesortuno

tests/cuboid_mesh_test.py

@@ -1,6 +1,6 @@
 from __future__ import print_function
 import numpy as np
-from .cuboid_mesh import CuboidMesh
+from fidimag.common.cuboid_mesh import CuboidMesh
 
 
 def allclose(a, b):

tests/integrators_test.py

@@ -8,7 +8,7 @@
 import pytest
 import numpy as np
 from math import ceil
-from .integrators import euler_step, runge_kutta_step, StepIntegrator, ScipyIntegrator
+from fidimag.common.integrators import euler_step, runge_kutta_step, StepIntegrator, ScipyIntegrator
 
 
 interval = (0, 10)