Turning in (encrypted) software part of exercise sheet 3. Added my own public key to the root of the repository.
first exercise on sheet 5
updated first exercise on sheet 5
Create folder dag2013-cecilia with polymake extension
Include direct_sum.cc in the proper folder
Merge pull request #18 from cgiron/master

cgiron: Sheet 3, Software exercise 1
Merge remote-tracking branch 'origin/master' into exercises
Merge remote-tracking branch 'upstream/master'
minor edit
second exercise, sheet 5
Added lecture 5
Added Alex's extension for sheet 3
merged lecture 5
Merge remote-tracking branch 'upstream/master'
work on exercise 2
finished sheet 5
Completed Sheet 5
Merge branch 'master' of https://github.com/alex-alvarez/discrete-geometry-lecture-notes into alex-alvarez-master
Merge branch 'alex-alvarez-master'

Conflicts:
	2013/coding/dag2013-alex-alvarez/apps/polytope/src/direct_sum.cc
Merge remote-tracking branch 'origin/master'