correct some doc typos.
Add a 'indent' option for new(), such that we can pretty-print the HTML
fix html() to return the inner html

the getter html() was out of sync with its setter() and would return
not the inner html of the $wq object but its wrapping tag as well.

Note that the fix also match the behavior of jQuery itself.
document the remove() method
add as_html()
fix wq() to accept html fragments
replace_with
Merge pull request #6 from yanick/master

Add option to pretty-print HTML