Merge pull request #56 from ping19/master

Some changes to titleScreen()
Update README.md
Merge pull request #57 from Lerogero/master

Update README.md
UFO Sprite
Merge pull request #58 from katiewood/master

UFO Sprite
change sprite
Merge pull request #59 from katiewood/master

change sprite
resets time when restart game and label enhancement
Merge pull request #60 from katiewood/master

resets time when restart game and label enhancement
add new enemy sprite
Add in ship 2 sprite
Merge pull request #61 from katiewood/master

add new enemy sprite
add in ship 3 sprites
Merge pull request #62 from katiewood/master

add in ship 3 sprites
change ship 3 size
Merge pull request #63 from katiewood/master

change ship 3 size
Character selection implemented
Merge pull request #64 from dreamteam69/master

Character selection implemented
Change options to feel more like the system
Merge pull request #65 from dreamteam69/master

Change options to feel more like the system