Removed gender-specific pronouns, racist remarks, hateful language, and condonement of rape culture

As titlted, this pull request is a attempt to clean up the code of Reddit from bigoted, creepy, misogynistic, transphobic, racist, homophobic, or just reeking of unexamined, toxic privilege.  The rationale behind this pull request is [detailed here](http://www.reddit.com/r/ShitRedditSays/comments/o0pdv/meta_srs_faq/).

# Detail of each commit

## Neutralised gender-specific pronouns

Reddit's code presumes that the Redditor is male.  Don't do this.

## Removed racist remarks

The word "Black" has historical undertones that suggest oppression.  Rather than segregating a definite "black" from the "white", we should celebrate the CSS stylesheets as we celebrate our human race — One World, One Race, One Continuity of Greyness.

## MUH FREEZE PEACHES

Goes without saying.  "Free speech" is not an excuse for hate speech.

## Remove hateful language about bricks

"Screw" is a very problematic word.  Also, saying that words inherently mean something goes against social constructivism, so we've changed that.

## Remove rape culture in comments

Words like "fuck" should not be used.  They may trigger the millions of people who use Reddit everyday, without knowing that the source code of Reddit condones rape culture.