OSX: Add profile on slow system to the list

On the previously tested systems Bubblemon has been running fine, but
when I tested it on an arbitrary slow machine it made the Dock use up
a lot of extra CPU.

This needs to be remedied.
OSX: Don't re-scale the frame on every frame

Before this change we scaled the frame around our bubbles down every
time we displayed a new frame.

With this change in place, we only scale the frame when the view
changes its size. This improves BubblemonWindow performance by 30%.
OSX: Lower framerate from 25FPS to 10FPS

This is the only thing we can do to lower the CPU consumption of the
Dock process, and 10FPS still looks OK.
OSX: Add release instructions

Document how to make a new release and publish it.
OSX: Add TODO about forcing Dock to left or right

Dock performance (which we can't really affect) is about 4x slower
with the Dock at the bottom of the screen compared to when having the
Dock on the side of the screen.

We should ask users when installing if they want their Dock moved to
the left, moved to the right or to not install Bubblemon.
OSX: Turn off image scaling interpolation

This improves com.apple.dock.extra performance a bit.
OSX: Drop water alpha

This improves rendering performance a bit.
OSX: TODO: Upgrades and horizontal dock handling
First shot at the new icon

A CPU with a liquid meter in it.

The CPU looks nice, the liquid meter doesn't.