Fix for the blank lines when entering fullscreen on Yosemite

I did a little re-arrangement of the methods called during the fullscreen animation and its *almost* working. 

**The problem:** When the animation finishes a gray line appears on the right side of the screen. Call to `[self resizeWindowToFitContentSize:[vimView desiredSize] keepOnScreen:YES];` at the end of all the animations fixes it, but still for a second there's an annoying blink. If anyone has any clues how to fix this, it will be great. 

![annoying_grey_column](https://cloud.githubusercontent.com/assets/356117/5053315/5bfc53d6-6c49-11e4-8ac5-f09aed04e7e6.png)