I extended the LineDiff.tokenize function to add the ability to ignore
leading and trailing spaces when using TrimmedLineDiff, and added
diffTrimmedLines to the public-facing functions. My changes should not
affect any previous functionality.

Refactoring to avoid changing tokenize API, adding documentation to
README.md, and adding 4 tests for TrimmedLineDiff to diffTest.js.

I also found a bug in how TrimmedLineDiff handled windows new lines
while adding the test, as well as changed TrimmedLineDiff so it doesn't
add a newline character ('\n') if it is the last line.

I updated the Readme with the Function rather than the Object name.

In the windows new line merge, I added a check for '\n', as well as
added a comment. The reason I've extended the windows new line merge
functionality is to handle any situations where '\n\n' may come up. We
want '\r\n' instead.

Fixing everything discussed in the pull request. Also noticed the
comment for the Trimmed Line Diff tests just said Line Diff, and fixed
if ( style lower in diff.js

Adding Diff Trimmed Lines