Tmux with Powerline

.tmux.conf

# powerline
source /usr/local/lib/python2.7/site-packages/powerline/bindings/tmux/powerline.conf
set-option -g default-terminal "screen-256color"

# remap prefix to Control + a
set -g prefix C-a

# bind 'C-a C-a' to type 'C-a'
bind C-a send-prefix
unbind C-b

# vi mode
set-window-option -g mode-keys vi

# easier copy and pasting
unbind p
bind p paste-buffer
bind-key -t vi-copy 'v' begin-selection
bind-key -t vi-copy 'y' copy-selection

# border color
set -g pane-border-fg colour31
set -g pane-active-border-fg white
set -g pane-active-border-bg default

# mouse mode on
set -g mouse on