Fixing vertical spacing issue when using Chart title and subtitle togeth...

...er.

@anutron

![before](http://f.cl.ly/items/292b353M3x2j0Z3r3s2E/Image%202014-07-15%20at%201.17.16%20PM.png)
![after](http://f.cl.ly/items/393f4241422s3O222K31/Image%202014-07-15%20at%201.17.49%20PM.png)