Chairs in Minecraft easy and simple!

V1.0.0:
/summon MinecartRideable ~ ~1.5 ~ {CustomDisplayTile:1,DisplayTile:oak_stairs,DisplayOffset:15,Riding:{id:"Chicken",Attributes:[{Name:generic.maxHealth,Base:1}],HealF:1,PersistenceRequired:1,NoAI:1,Silent:1,ActiveEffects:[{Id:14,Amplifier:1,Duration:199980,ShowParticles:0b}]}}

V1.2.0:
/summon MinecartRideable ~ ~1.5 ~ {CustomDisplayTile:1,DisplayTile:oak_stairs,DisplayOffset:10,Riding:{id:"Chicken",Attributes:[{Name:generic.maxHealth,Base:1}],HealF:1,Rotation:[100f,0f],PersistenceRequired:1,NoAI:1,Silent:1,ActiveEffects:[{Id:14,Amplifier:1,Duration:199999980,ShowParticles:0b}]}}

V1.3.0
/summon FallingSand ~ ~1 ~ {Tile:oak_stairs,Block:oak_stairs,TileEntityData:0,Time:1,Riding:{id:"EntityHorse",Type:0,SaddleItem:{id:saddle},Variant:0,Tame:1,Invulnerable:1,PersistenceRequired:1,NoAI:1,Silent:1,ActiveEffects:[{Id:14,Amplifier:0,Duration:20000000,ShowParticles:0b}]}}

Copy a code above and paste it into a command block... There must be a block above the command block (preferably glowstone so that the chair is not dark) for the chair to work... Power the command block with redstone... And that's the last thing to make your chair! Note that there is an invisible chicken in the block above the command block that cannot suffocate or be moved... When you summon it and you want to break it... Be sure the kill the chicken too. The chicken will be killed in 1 hit or by the /kill command.
NOTE: V1.3 allows the use of rotation! To rotate the chair change "TileEntityData:0" to "TileEntityData:1" or higher. Play around with it a little until you have the correct position.