chap1 finished.
task 1: all done, including dealing with different heights of two scenes
Merge branch 'master' of https://github.com/gloryming/First-Game
Merge branch 'master' of https://github.com/gloryming/First-Game
Merge branch 'master' of https://github.com/gloryming/First-Game
finished chapter2
Merge branch 'master' of https://github.com/gloryming/First-Game
Merge branch 'master' of https://github.com/gloryming/First-Game
replaced imgs
Merge branch 'master' of https://github.com/gloryming/First-Game
finished chapter2
Merge branch 'master' of https://github.com/gloryming/First-Game
Merge pull request #9 from kagada/master

zhengweilin
Merge pull request #8 from Iakgun/master

task 1: all done, including dealing with different heights of two scenes
Merge pull request #7 from Zeoh/master

chap1 finished.
Merge pull request #10 from magic8sky/master

finished chapter2
replaced imgs
Merge branch 'master' of https://github.com/gloryming/First-Game
part 2 finished.
Revert "part 2 finished."

This reverts commit a8c101a1b2cc8d0a97bc1bea54a88098656bf72a.