.gitconfig: Add comment about `color.ui` in Git ≥ 1.8.4

Ref. #239.

(cherry picked from commit 5c896ab0efe19a48bf9b8e6de81386711ce0f673)
.osx: Don’t automatically rearrange Spaces

Closes #213.

(cherry picked from commit 475402ab4dc796b8e69542587d0926d5e3d30c7a)

Conflicts:
	.osx