add games
Merge pull request #6 from MartinKies/master

better bargaining diagnostics
update rps, and reports

reports can now depend on game. they are specified in .yaml files in the
reports folder.
games can now also run with a fixed number of periods, example in the
rock-paper-scissors game with costs
Merge remote-tracking branch 'upstream/master'

Conflicts:
	R/shiny_reports.r