modified the documentation of the Arpack solver
corrected Arpack section in Step-36
added a step-36 test to arpack category
Initialization of FEEvaluation like FEValues

A new way to initialize an FEEvaluation object (fast tensor product evaluation routines) has been introduced.
It takes the same arguments as the initialization method of FEValues, namely a Mapping, a FiniteElement, a
one-dimensional Quadrature<1> object, and update flags. This enables using FEEvaluation on the fly just as
FEValues. Since FEEvaluation treats objects of one base element only, this class can select which components
to read.

The concept is explained in the documentation of the FEEvaluation class and an example for the Laplace matrix
is given. However, it also works for the Stokes operator as shown by the test program assemble_matrix_02.
Merge pull request #258 from kronbichler/matrix_free_assembly

Initialization of FEEvaluation like FEValues
Merge pull request #263 from davydden/arpack

Arpack
Adjust normalize.pl for p4est 1.1+.

We have a number of tests that use p4est output functionality, but the
format p4est writes in has changed in recent p4est versions. Delete the
lines that differ in normalize.pl and adjust stored test output files
accordingly.
Merge pull request #266 from bangerth/adjust-tests-for-p4est-1.0+

Adjust normalize.pl for p4est 1.1+.
Fix testsuite, cleanup tests in arpack/
Fix mathjax on website broken due to https

The dealii.org webserver now tries to serve https sites. This breaks mathjax because of:

Mixed Content: The page at 'https://www.dealii.org/developer/doxygen/deal.II/step_31.html' was loaded over HTTPS, but requested an insecure resource 'http://cdn.mathjax.org/mathjax/latest/MathJax.js'. This request has been blocked;

This commit fixes this by loading it over https.
Merge pull request #268 from tjhei/fix_mathjax_on_website

Fix mathjax on website broken due to https
Merge pull request #267 from tamiko/fix_testsuite

Fix testsuite, and cleanup the test in arpack
silence icc warning #15531 "A porition of SIMD loop is serialized"
Merge pull request #269 from tamiko/make_icc_happy

silence icc warning #15531 "A porition of SIMD loop is serialized"
Avoid compiler with gcc 4.7
Pass TriaIterator<DoFCellAccessor> by reference ant not by value

This makes the interface of FEValues::reinit consistent between Triangulation::cell_iterator and DoFHandler::cell_iterator.