Ran boostrap.
Adding PYRAMID13 basis functions.

Maple script used to compute these basis functions:
https://gist.github.com/jwpeterson/7853458
Adding first derivatives for PYRAMID13.
Adding second derivatives for PYRAMID13.
Add PYRAMID13 support to build_cube().
Add support for writing 13-node pyramid elements to Exodus files.

These don't seem to display properly in paraview... the issue seems to
be that, at least in the Exodus format, Paraview only reads the first
5 nodes of the 13-node element.  So it will display a mesh containing a
single pyramid just fine by ignoring all the points after the first 5,
but if there are multiple pyramids present in the file, the mesh will
be garbled.
Adding PYRAMID13 support in miscellaneous places:
* string_to_enum()
* Various functions in fe_lagrange.C
* Quadrature initialization routines
* FEAbstract::on_reference_element()
* lagrange_nodal_soln() helper function
* FEAbstract::get_refspace_nodes()
* FEInterface::max_order()
* l2_lagrange_n_dofs()
* monomial_n_dofs()
* xyz_n_dofs()
* Quality::valid()
* ElementTypes::basic_name()
* ElementTypes::name()
* QGrid::init_3D()
Merge branch 'pyramid13'

Whew, had to fix a number of merge conflicts caused by the whitespace
changes by hand in order to merge this old branch.  If anyone else is
facing the same issue, please let me know and I can try and help you
out.

Conflicts:
	include/enums/enum_elem_type.h
	include/libmesh/Makefile.am
	src/fe/fe_abstract.C
	src/fe/fe_interface.C
	src/fe/fe_l2_lagrange.C
	src/fe/fe_lagrange.C
	src/fe/fe_lagrange_shape_3D.C
	src/fe/fe_monomial.C
	src/fe/fe_xyz.C
	src/geom/elem.C
	src/mesh/exodusII_io_helper.C
	src/mesh/mesh_generation.C
	src/utils/string_to_enum.C
Fixing macro bug introduced by whitespace scripts.
minor fix to avoid foo.m.e filename
fix for Solaris Studio
fixed bug in SerialMesh::stitching_helper related to incorrect boundary IDs when two surfaces within the same mesh.
Fix for --disable-amr.

We need the my_next_elem counter to get incrimented always, even when AMR is disabled.
Updating misc. references:
* Novascone, 2013c.
* Nam, 2008
* Rammerstorfer, 2008
* Mahadevan, 2010.
* Amar, 2011
* Kirk, 2011
* Camata, 2011
* Hussan_2011 -> Hussan_2012

Also spell checked references, although this is a pretty useless exercise.

Updated the references webpage.

Updated citation statistics figure.
Grote, 2013
modification to grid quadrature so that the quadrature points are the mid-points of each interval, as opposed to the ends of each interval.
Add DofMap::local_variable_indices()
Added LinearSolver::init_names()
KSPSetOptionsPrefix calls PCSetOptionsPrefix

So we don't need to do so redundantly
Check for errors, simplify code