Enable C-<arrows> to work in tmux and color fix

screen-256color is better for my purposes
since it allows to toggle bright/dark schemes without
any graphical glitch.

Signed-off-by: Mattijs Korpershoek <mattijs.korpershoek@gmail.com>
Merge branch 'master' of github.com:kir0gawa/dotfiles

Conflicts:
	.tmux.conf