v0.4

v0.4 contains some client improvements to be more robust, and faster uploading games.

It also has tree re-use now, which should provide a substantial speed boost to game generation, and gameplay.

Contributors this release were (in alphabetical order):
Andy Olsen
Douady Pâris
Error323
Gary Linscott
davidsoncolin
davidxu90
evalon32
gsobala
jjoshua2