Upgrade to BubbleWrap 1.5.0

[cspeer]

Hey,

I did 4 things:

1. I changed the gemspec to require BubbleWrap 1.5.0
2. In the StatusBar::Base initialize method I got rid of the return statement within the timer block since it causes an error. This describes the problem the best: http://goo.gl/0NnUAy
3. In lib/status_bar.rb I added a require statement to require sugarcube in it's entirety. Without it SugarCube::CoreGraphics wouldn't be present.
4. I bumped the version to 0.2.4

I tested the changes with BW 1.5.0 as well as 1.4.0, both work for me just fine :)

Cheers

• Chris