Add calculateExponent function
September 30th Hw
Merge pull request #2 from emmya/master

Add calculateExponent function
Merge pull request #12 from JoshuaNotowitz/master

September 30th Hw
Fix my homework assignement.
Merge branch 'master' of https://github.com/wdi-sf-september-2014-hw/js_control_flow
Fix my js_control homework