Settings for CtrlP

New files are now opened in hidden buffers

Signed-off-by: Mattijs Korpershoek <mattijs.korpershoek@gmail.com>
Tmux colorscheme update

Since tmux is not reacting the same to xterm terminals,
this config is now updated for urxvt.

Signed-off-by: Mattijs Korpershoek <mattijs.korpershoek@gmail.com>