Installation fixes for 2013-09-bristol bootcamp

FIxes a few issues in the installation instructions and setup test program ready for the Bristol bootcamp. Specifically:

* We had a 'git://' URL for people to pull from. This won't work for people who don't have a github account. (Bristol bootcamp specific).
* Adopt the 'VM is a backup' wording used in the bc repo. (Bristol bootcamp specific).
* Remove the test for jinja from the installation test program. We don't need it and it is not in the VM image which could cause confusion. (In the long term this is probably best fixed by updating the VM image, but this could go into bc.)
* Handle the version string ('1.0.dev') in IPython that comes with Canopy. (This may be worth copying into bc.)

If anything does need to go into bc let me know and I'll generate an issue there.