vagrant:
  - check actual IP;
  - only init machine first time, just as native installations;
  - add .bash_profile to permissions fixup;
  - cleanup excessive newlines in making .bash_profile;

README:
  - include admin & debugging use;
  - info about re-initializing VM & manually running create-dev-env.sh;
  - add django admin & debug_toolbar setting info

Conflicts:
	AUTHORS
	scripts/vagrant-provisioning.sh

Otherwise, `vagrant ssh` doesn't load the rbenv shims, because that line is in
the .bashrc file.

Yarko's `$BASE` patch has been merged and rewritten since
the original pull request was created, resulting in the `$BASE` being
incorrectly set to the default `/home/vagrant/edx_all` by the new code.

To allow the vagrant user to create the /opt/edx/[log|data|db] folders

Compatibility with the Filesystem Hierarchy Standard: http://www.pathname.com/fhs/

Cf README, this adds support to install and setup a dev instance through
Vagrant. The Vagrantfile at the root handles the vagrant commands like
`vagrant up`.

Provisioning is done by the shell script `vagrant-provisionning.sh`,
which is a light wrapper around the `create-dev-setup.sh` which does
most of the job using the standard process, but limiting possible
side-effect by ensuring the environment on which the install is
performed is clean.

Based on an Ubuntu precise 12.04 LTS.