Merge pull request #16 from mlund/master

Update 03.11.2014
Merge pull request #17 from mlund/master

Fixed tiny bug due to unassigned variable.
Updated playground.
Merge pull request #18 from mlund/master

Update.
Updated playground.
Minor bug in one of my programs.
Added new analysis to one of my programs.
Last changes to Stephanie's program.
Merge pull request #63 from jmhenriques/master

Big update in my playground.