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.