Merge pull request #24 from kshah2451/master

rebasing my branch to master
mine tower implemented
Merge branches 'master' and 'BTowns' of https://github.com/kshah2451/EECE-381-Module-1 into BTowns
added poison/slow logic
limited amount of sharks on screen, and started freeing all memory function, can free sharks and gamedata but not bullets or towers as of this commit
Merge pull request #26 from kshah2451/BTowns

B towns