Moved solver to utilities. But it is still available as SimPEG.Solver (as defined in the main __init__.py file)

SimPEG/utils/__init__.py

@@ -2,6 +2,8 @@ import matutils
 import sputils
 import lomutils
 import ModelBuilder
+import Solver
+from Solver import Solver
 from matutils import getSubArray, mkvc, ndgrid, ind2sub, sub2ind
 from sputils import spzeros, kron3, speye, sdiag
 from lomutils import volTetra, faceInfo, inv2X2BlockDiagonal, inv3X3BlockDiagonal, indexCube, exampleLomGird