Added support for LuaLaTeX
Added package hologo for use in typesetting XeLaTeX logo and changed /XeLaTeX to \hologo{XeLaTeX} throughout
Changed "fontspec" to "setmainfont" for LuaTeX compatibility
Fix for LuaTeX compatibility

Removed \usepackage{xltra}. Instead use \usepackage{hologo} for XeLaTeX logo
Merge pull request #60 from davebellows/update-manual

Various fixes for LuaTeX compatibility