解决图和表目录的链接问题

调整diss.tex中添加图目录和表目录的语句位置，解决了图和表目录的链接问题
Reorganize the dirs and files.
Organize the sjtuthesis.cls
Organize the thesis.tex
Add to TODO: refine the LaTeX code convention in this template.
Add git target into Makefile.
Add TODO.
Remove "fonts" and "test" dirs.
Start to work on the "allinone" branch again.
Article layout in ConTeXt.
Add a framework for context thesis.tex
zhfont module works now.