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/features.md

@@ -0,0 +1,29 @@
+===============
+FEATURES / TODO
+===============
+
+- Parallel design
+- Sparse matrices
+- Discontinuous Galerkin?
+- 100% Tested
+  - Automatic coverage (Travis CI)
+- Doctest examples and tutorials
+  - Intuitive to use
+- Marketing
+  - Engineering porn
+- Field functions
+- Multiphysics platform
+  - Elasticity
+  - Thermal implemented
+- Transient and steady solvers
+  - Implicit dynamics
+- Nonlinearities
+  - Geometrical
+  - Material
+  - Contact
+    - Mortar
+- Modular design
+  - E.g. contact formulation can be altered by user
+- Mesh and results format, Xdmf?
+- No scalars but field variables, e.g. no constant 210GPa for steel, we interpolate variable from nodes.
+  - (Constant is a special case of field variable).