* Redefined the theindex environment to reflect the design of Tufte's index.
* Defined the \paragraph command to print the paragraph heading inline in italics followed by an em space.
* Copied documentation from the sample handout to the sample book.  


git-svn-id: https://tufte-latex.googlecode.com/svn/trunk@95 516e2f36-ce3a-0410-bea4-1d4a03f5df72