Add some demos and tools from some books.

	new file:   git-completion.bash
	new file:   templates_demo/6_1_1/demo_6_1_1
	new file:   templates_demo/6_1_1/myfirst.cpp
	new file:   templates_demo/6_1_1/myfirst.hpp
	new file:   templates_demo/6_1_1/myfirstinst.cpp
	new file:   templates_demo/6_1_1/myfirstmain.cpp
	new file:   templates_demo/README
	new file:   thinkingc++_demo/log.txt
	new file:   thinkingc++_demo/unibuf
	new file:   thinkingc++_demo/unibuf.cpp