Delete paren-face customization.

Delete paren-face customization. 

I am using a theme with a light background and the parens are nearly invincible when set to color "honeydew4". I know how to customize this, but everyone using a light but not white background would have to do so.

Please see this 
![screenshot](https://f.cloud.github.com/assets/2273210/1681335/18e64286-5d91-11e3-8045-8c8210cbed5a.png) 
it is especially hard to distinguish at first glance between ( and [ .