Introduce NextLevel object, level work.
Merge branch 'master' of https://github.com/rliebz/Puddle

Conflicts:
	Game1.cs
Start value updates.
Merge branch 'master' of https://github.com/rliebz/Puddle

Conflicts:
	Game1.cs
Checkpoint object created as powerup, resets player respawn. Holdbuttons back to previous workability, still working on drawing.
Merge branch 'master' of https://github.com/jakerose27/Puddle

Conflicts:
	Content/Level1.tmx
	Level.cs
	Objects/Player.cs
	Puddle.csproj
Merge pull request #15 from jakerose27/master

Checkpoint and holdbuttons.