Update issue 37
modified dof table and make the data structure more dynamoc to handle mortar
start change all over the place to handle the mortar
erasing elements from mesh
Merge branch 'master' into mortar

Conflicts:
	feel/feeldiscr/doftable.hpp
Update issue 42
deleting elements
Update issue 42
added test + implementation of fusion of two meshes
Merge branch 'master' into mortar
Update issue 42

still segfault'ing
Update issue 42

still segfault'ing
Merge branch 'mortar' of https://code.google.com/p/feelpp into mortar
now dof table use unordered_map 
in 2D
 there is still a problem with deletion of elements in parallel, in sequential
 it seems to work (more tests needed)
cleanup some mesh function using new c++11 lambda functions
Merge branch 'mortar' of https://code.google.com/p/feelpp into mortar
fix compilation
Merge branch 'master' into mortar

Conflicts:
	doc/manual/tutorial/laplacian.cpp
	doc/manual/tutorial/mymesh.cpp
	feel/feeldiscr/doftable.hpp
	feel/feeldiscr/meshimpl.hpp
add renumbering of dof
Merge branch 'master' of https://code.google.com/p/feelpp into substruct
update dof markers
up
Merge branch 'master' into mortar
Merge branch 'master' of https://code.google.com/p/feelpp into mortar