Update braid-examples.tex

It was written for an older version of braids.sty, so update it
to reflect the current version.
Make pdf rule generic

There are other .tex files here that we want to compile, such
as braid-examples.tex say.
Ignore .DS_Store files
Use the year of submission on the title page

It is confusing to have the current year there, when this document
was actually written in 2007.
Update README