support for Debian Wheezy

Per request by original author, here is a pull request containing updates in order to do a complete site install on a vanilla Debian Wheezy os.

Includes other assorted updates such as
- Oracle Java7 for Debian Wheezy via the webupd8team repo
- moving site specific files such as inventory files to sample files (and some safety checks in the scripts such as bootstrap/bootstrap.sh)
- documentation
- checks for already installed packages in the bash scripts, rather trying to install it twice
- removed stray null characters in the source files