Added configuration files for ZSH with aliases, functions and exports

Signed-off-by: Fran Diéguez <fran.dieguez@mabishu.com>
Added git configuration files

Signed-off-by: Fran Diéguez <fran.dieguez@mabishu.com>
Add Tmux and Screen configuration files

Signed-off-by: Fran Diéguez <fran.dieguez@mabishu.com>
Add Vim configuration files (requires submodule update)

Signed-off-by: Fran Diéguez <fran.dieguez@mabishu.com>