Created the Instructions backbone

Adding button and new view controller, backed the storyboard changes
with the new classes.
Added text for instructions
Merge branch 'develop' into feature-finishInstructions
added sound to buttons

Including instruction / back, credits/back, back from start game.
Addressing excessive spacing
Fixed the spaces around =
Adjusted start/instructions/credits button spacing
Merge branch 'develop' into feature-finishInstructions
Merge pull request #66 from zsweedyk/feature-finishInstructions

Instructions + Sound for main menu buttons