First commit.
Add a compile step to refer the bibliography.

Do I have to compile three times ?
Modified Makefile and README

The changes in Makefile are about variables in the document name
specification, and compile rules.  In the former change, the .svg and
.tex files used in the document are specified by the directory name.  In
the latter change, improved the dependencies of the compile rules.  The
README.md is modified for the changes of the Makefile.

* Makefile: Modified the variables and rules.  The changes are explained
in the above.
* README.md: Modified for the variables in Makefile.