Added command-line option to disable the curses.A_BOLD

The Solarized color scheme for terminal uses the bold attribute for another purposes, so the colors are lost:

![Screen Shot 2013-02-16 at 11 12 06](https://f.cloud.github.com/assets/231995/163479/f873d25c-783a-11e2-8b50-42b2741f92eb.png)