Renames README.txt to README.orig.txt and adds README.md.

The README.md have new documentation of the ongoing project
changes, and will keep documentation in sync with the project
source code.

--HG--
branch : maven
rename : README.txt => README.orig.txt
Add new documentation for cloning from Github.

--HG--
branch : maven
Downgrades the Hibernate version to 3.1.3

--HG--
branch : maven