changed files
new header
New StructuralSolver class
New StructuralMaterial abstract class plus two classes to define
the Venant-Kirchhoff material linear and nonlinear

Test folder for these new classes
changed files
new header
changes to update the branch to the zero numbering
Changes in the assembling functions to update it to the zero numbering merga
changed the getters for mu and lambda in the assembling of the linear stiff matrix.
Tried to change the elementary matrix M_elmatK from pointer to a matrix into a matrix.
Problems in compiling, so returned to the previous situation.

TODO: change the elmatk from a pointer to a matrixElemental.

LifeV compiles and the test_structuralsolver as well.
changed test and updated the boundary conditions to the zero numbering
First attempt to insert SS in FSI. LifeV compiles and the test_fsi as well.

TODO: in FSIExatjacobian a method iterateLin is needed but not defined yet!!!

for the test, fixedpoint will be used.
added the registration of the factories
LifeV and the test compil but I have problems on th convergence.
Used ExactJacobian in segregated FSISolver.
For these purpose, some methods have been added in StructuralSolver (SS)

Inserted the registration of the nonlinear materialtype in the factories.

At this point, the FSI Solver with SS and linearVenantKirchhoff material
works and the results seem to be the same as in default test_fsi of lifev.

TODO: check the results.
Test with nonLinear Material
Changes in the StructuralMaterial class:
  - boost scoped prt for MatrixElemental instead of boost shared
  - removed a lots of warning in the SS and SM classes
  - creation of a unique method to compute Stiffness matrix
  - automatic compilation of the test in testsuite
  - all the test run and they are ok.
Added few lines in the nonlinear methods to read meshes with different markers of volumes
First attempt to insert SS in FSI. LifeV compiles and the test_fsi as well.

TODO: in FSIExatjacobian a method iterateLin is needed but not defined yet!!!

for the test, fixedpoint will be used.
added the registration of the factories
LifeV and the test compil but I have problems on th convergence.
Added incompressible structure example
Merge branch 'master' into cippalippa

Conflicts:
	life/lifesolver/FSIOperator.hpp
Fixed conflicts for the Structural Solver Branch