update to 3.1.1 and meteor 0.7.1

I created a little bash script which automatically updates most of the project with `./update.sh "path/to/bootstrap/git"`. This includes

- The less files are copied and renamed
- The JavaScript files are copied and added into the `package.js` in a specified order (new files would have to be added to the bash script in order to appear in the package.js
- The fonts are also copied and added to the `package.js`. Those are all automatically added.

Also I put the advanced usage examples into the readme and updated them for the `.import.less` change.