Use the original sources for some plugins.
tmux key bindings for paste mode.
Dropping Solarized in favour of Lucius

Solarized is a great theme, but I wanted something more neutral,
that still provided with a "Light" and a "Dark" theme.

This commit is rather big, it includes:

1. An improved installation method for iTerm2.
2. tmux status bar changes.
3. prezto theme changes.
4. solarized theme removal.
5. Commands such as ThemeDark and ThemeLight for all of them Theme<tab>