Cleanup of obsolete files

A lot of old files from old documentation systems etc. is in package.
These are now removed or moved. Old notebooks are in docs/tutorials.
This PR closes issue #124.

docs/src/links.md

@@ -0,0 +1,31 @@
+Links
+=====
+
+Discretization
+--------------
+http://code.activestate.com/recipes/579021-delaunay-triangulation/
+
+
+Interpolation
+-------------
+- http://www.cs.rpi.edu/~flaherje/pdf/fea4.pdf
+- http://www.sd.ruhr-uni-bochum.de/downloads/Shape_funct.pdf
+- http://what-when-how.com/the-finite-element-method/fem-for-3d-solids-finite-element-method-part-1/
+- http://www.uni-tuebingen.de/zag/teaching/environmental_modeling/S4B_FiniteElements.pdf
+- http://www.colorado.edu/engineering/CAS/courses.d/AFEM.d/AFEM.Ch10.d/AFEM.Ch10.pdf
+- http://www.colorado.edu/engineering/CAS/courses.d/AFEM.d/AFEM.Ch10.d/AFEM.Ch10.Slides.d/AFEM.Ch10.Slides.pdf
+- http://www.colorado.edu/engineering/CAS/courses.d/AFEM.d/AFEM.AppI.d/AFEM.AppI.pdf
+- http://www.code-aster.org/V2/doc/default/en/man_r/r3/r3.01.01.pdf
+- http://www.researchgate.net/publication/267082822_Unified_isoparametric_3D_Lagrange_finite_elements
+
+Integration
+-----------
+- http://arxiv.org/pdf/1411.1341.pdf
+
+Hierarchial shape functions
+---------------------------
+- https://www.math.vt.edu/people/adjerids/research/papers/basis.pdf
+
+Solvers
+-------
+- https://github.com/JuliaSparse/MultiFrontalCholesky.jl