Update php phar to handle maths flavoured markdown

The command line phar in bin/markdown can now parse maths flavours when
passed the --flavor=maths argument. Useful to dump the actual renders of
the parse as I test this branch.
Add to css styles for phar's --full argument

The --full argument html template has had css styles added to it, st the
text is more carefully defined, and a containing div was introduced to
render a primative 1 column layout. The mathjax script from the cdn was
also added.

All modifcations point towards what I would like as a final design html
render.
Remove mathjax script from unit test files

I had called the mathjax cdn scripts in the unit tests st the latex code
would be rendered, rather than just look ... like latex :D. With the
modifications to the --full argument of bin/markdown, I don't need to
include the script in the test files now, as I can simply parse the test
.md's through the phar, and it will point to the script if I add the
--full argument.
Remove redundent unit test files for maths flavour

Even though I probably should be more carfull with my unit tests, at the
moment I don't plan on modifying these deleted files specifically for
the maths flavour. However any modifications I could make are
practically covered in the other maths specific unit tests, so nothing
to really worry about :D