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.
Make adjoints_ex3 solver verbose

This example is too prone to convergence failure in various buildbot
combinations; let's make sure we can easily see why it fails.
Add absolute_residual_tolerance to adjoints_ex3

This should avoid the convergence failures we were seeing when running
with Real==float in parallel.
bump version in master to 0.9.3-pre
Merge pull request #106 from dknez/miscellaneous_ex9

miscellaneous_ex9 - Let's have at it.
incorporate misc_ex9 to build environment
Make objects in FEMContext private, forcing users
to the use API that was finalized in #108.
Note update on FEMContext public members going private.
Merge pull request #110 from pbauman/no_really_privatize_fem_context

Make objects in FEMContext private
Bugfix for adjoints_ex4 adaptive refinement
Fix and reenable AdjointRefinementEE splitting

We should satisfy sum(local_error_estimates) == global_estimate now,
and the algorithm should be O(N log N) rather than O(N^2).
Cut-n-paste typo fix in adjoints_ex4
Dirichlet bugfix on refined meshes

Calculating Dirichlet values should only happen on active elements.
This was breaking horribly on mesh coarsening.
AdjointRefinementEE bugfix

Don't try to restore any vectors that we didn't walk in with.
Adding Toader 2013 preprint.