Bullet class with shooting in one direction

Created a bullet class with a standard bullet texture. Currently fires
in one direction.
Merge remote-tracking branch 'origin/master'

Conflicts:
	pairproject/FlappyBird.userprefs
	pairproject/FlappyBird/AppMain.cs
	pairproject/FlappyBird/Enemy.cs
	pairproject/FlappyBird/FlappyBird.csproj
	pairproject/FlappyBird/FlappyBird.pidb
	pairproject/FlappyBird/Player.cs
	pairproject/FlappyBird/bin/Debug/FlappyBird-signed/Application/app.exe

	pairproject/FlappyBird/bin/Debug/FlappyBird-signed/Application/app.exe.mdb

	pairproject/FlappyBird/bin/Debug/FlappyBird-unsigned/Application/app.exe

	pairproject/FlappyBird/bin/Debug/FlappyBird-unsigned/Application/app.exe.mdb
	pairproject/FlappyBird/bin/Debug/FlappyBird.psdp
	pairproject/FlappyBird/obj/Debug/FlappyBird.csproj.FileListAbsolute.txt
	pairproject/FlappyBird/obj/Debug/app.exe
	pairproject/FlappyBird/obj/Debug/app.pdb
	pairproject/FlappyBird/obj/Debug/convertedpdb/app.exe.mdb