Updating github traffic statistics.
Updating references.
* Vavourakis, 2014.
* Nagler, 2014.
Updating citation plot and web page.
Updating statistics for March 2014.
Fixing legend on 'downloads' plot.
Updating web statistics plot files.
Write Tecplot header based on the dimension of the actual elements in
the Mesh, rather than mesh.mesh_dimension().
Factor out logical element dimension checking into a separate function
so it can be used in both the ASCII and binary writers.
Use elem_dimension instead of Mesh dimension in the binary Tecplot writer.
Add ability to search for X11 header files in different locations,
and pass this path down to the TECIO Makefile.
Adding t = "T n" to the header in the ASCII Tecpot files seems to be
enough to allow Tecplot to figure out how to animate Zones by clicking
through the Data -> Edit Time Strands dialog.
Adding Andersson 2014 preprint.
Merge pull request #219 from libMesh/tecplot

Write Tecplot header based on the dimension of the actual elements
Updating github site traffic.
Adding flag to allow appending to Tecplot ASCII files.

Tecplot seems perfectly happy to read files with multiple Zones,
but you have to repeat the Mesh each time as far as I can tell.

Also moving some inline files to source file rather than header.
Improve error message when an invalid order is selected for the
Lagrange FE family.
Use terser libmesh_error_msg() macro.
Improve error messages for non-LAGRANGE FE files.
No reason to only print a helpful error message in DEBUG mode.
Adding LOC data for April 2014.