Check for correct software

When testing on a clean install i noticed that it was possible to install the wrong version of vagrant (so like apt-get install vagrant on latest ubuntu gives you a version that doesn't include docker support) and this message would be lost as the screen scrolls past trying to install drupal into a container that hasn't been created.
So this is a tiny point release that checks for some software and bins out with nice error messages so you can at least work out whats going wrong.

hotfix for 0.2 version

Somehow I managed to leave an empty directory (src) in the repo and this was causing the build to fail in imaginative ways. This has now been fixed.

Beta with zero config and faster build

This build has taken comments from users - mainly Kevin Moll (@kmoll)

• Just run ./build_env.sh - a blank drupal site will be created - Developer:ENGAGE!
• make the src directory completely writeable
• make it like i'm developing a site locally
• improve build time by using container images instead of building from source - should build in 8 minutes on a 2013 macbook air (8gb ram)
• Xdebug working by default - just do it!
• improved readme (@timmillwood)

Next release

• Optimise PHP
• Optimise MySQL
• Gui for configuration!

Beta for public testing

Should be fully functional but isn't feature complete.