Merge branch 'stitch_mesh' of https://github.com/jwpeterson/libmesh

This branch optimizes SerialMesh::stitch_meshes.
Merge branch 'stitch_mesh' of https://github.com/jwpeterson/libmesh

John updated the branch to pass the tolerance down.
Merge branch 'master' of github.com:libMesh/libmesh

Merging master.
Merge branch 'master' of github.com:libMesh/libmesh
Merge branch 'master' of github.com:libMesh/libmesh
Added miscellaneous_ex9: Example that demonstrates a discontinuity on an internal mesh interface, which requires the sparsity pattern to be augmented.
Merge pull request #106 from dknez/miscellaneous_ex9

miscellaneous_ex9 - Let's have at it.