The complete.js script can now be dropped into any page

Closes #227

Signed-off-by: Jan Keromnes <janx@linux.com>

The setLineClass() function can set a class to a line, but
there's not way to get the current class of a line. This
commit adds the information to the lineInfo function as a
new property called "lineClass".

A copy-paste error had snuck in.

Closes #222

Closes #223

Closes #220

The latter strips newlines in IE9

These make it possible to do code folding.

There is now a textWrapping option (default false, for backwards
compatibility) that, when turned on, will cause text to be wrapped.
Line-based cursor movement still moves through such lines one at a
time.

This is quicker to update, and allows querying both by height and by
line number, which will help with the text-wrapping and code-folding
implementations.