RegexCheatSheet: Added other trigger words.
RegexCheatSheet: Added "regexp" to the end trigger.
RegexCheatSheet: Remove the padding and margin in the abstract.

Also move all inline CSS to style.css.
RegexCheatSheet: Added a heading and a media query.

Should change the layout at around 380px.
RegexCheatSheet: Made tests pass.
Merge pull request #260 from duckduckgo/jag/improvement/regexp

Regexp Improvements