Merge branch 'wendelin'

Let's merge and switch wendelin development to master.

For now we only add components which should be orthogonal to the rest
and cannot break things. Yet master is a focal point for joint effort
and people can try wendelin work-in-progress.

Acked-by: Ivan Tyagov <ivan@nexedi.com>

* wendelin:
  wendelin.core: Add part/recipe how to build it from git repository
  components: wendelin-core -> wendelin.core
  Add Ipython and pandas python libraries.
  Add wendelin-core.
  Add msgpack-python library.