Initial Makefile

This Makefile supports different Python versions of 2.6, 2.7, 3.3, and
3.4 with the default package set to IPython. You can use this Makefile
as a default template and add addtional build target to customize your
needs.
Hide private build target

Prepend those private build target with '_' so that it won't show up in
Bash double tab autocompletion.