#12 initial commit - method names created
undoing last command
undos more than 1 last commands
#12 starting from scratch
#12 undo_redo when empty, tests added
#12 undos several last commands
#12 redos several last undos
#12 blocks redo after successful command
#12 advanced tests added
Merge branch 'master' of https://github.com/gmamaladze/FreeUni-SDP-2014-Lab-Testing