Fix yourproject rendering problem in HTML

At least on the [github.io](http://twitter.github.io/scala_school/sbt.html) version, it used to render as `project/build/.scala` which is of course nonsense. By using fixed-width fonting, it makes the literal text and the variable text easier to distinguish, without resorting to characters that are meaningful to HTML.
Stop using fancy apos for command-line text

In my experience, readers are likely to try to copy-and-paste text which will not execute correctly when using "fancy" apostrophes. That specific text isn't designed to be executed, but it is a super-easy fix.
Fix hyperlink markup syntax

Proofreading! It's what's for breakfast!
Merge pull request #127 from mdaniel/sbt-typo

Fix some sbt.textile typos