Added support for the "normal" older version of the meta font.
Options for the meta font are now "metafont" for the older version
and "metaprofont" for the newer version. Take care that this
commit breaks the prevention to compile the class using xelatex
without one of the metafont options. See issue #12 of the main
repository.
Fixes Issue #12 in main repo. Arial is now used with xetex if no
metafont option is given. Packages microtype and times have been
removed. Fontspec is now included always when xetex is used.
Update README.md

Added metaprofont option description
Update README.md

Forgot ticks.
Merge pull request #15 from cspann/master

Support for 2 types of Meta fonts.