Merge pull request #1 from yvettecook/development

Development
Merge pull request #2 from yvettecook/development

Development
started refactoring game methods:
Frames can retrieve next frame's throw scores
Bonus score calculations started
Strike bonus scoring working
Total score calculation working
Attempting to make Second Throw object inherit from Throw - not yet successful. Cannot find assignSecondScore method
Not getting anywhere fast