added a GPA calculator that takes in (grade, credit) pairs and calculates gpa after the button is pressed
Merge pull request #5 from kraftery/connor

added a GPA calculator that takes in (grade, credit) pairs and calculate...
fixed the gpa display so it shows two decimal places. Also fixed the keyboards that pop up so that only numbers and decimal points can be entered.
Merge pull request #7 from kraftery/connor

fixed the gpa display so it shows two decimal places. Also fixed the key...
Merge branch 'master' of https://github.com/kraftery/FinalsApp into kieran
changed UI