Merge pull request #9 from stevez86/forrest-liorr

fixed restart bug by unbinding events, enforced full column restriction
implemented a timer
Merge pull request #10 from stevez86/timer

implemented a timer
saving progress in order to merge
Merge branch 'master' of https://github.com/stevez86/connect_4 into forrest-liorr
created function for computer to place piece