Amend welcome page

Just added some small changes to the welcome page:

1. Display the Rails version first (always the first thing I look for).
2. Adjust the CSS for the info table to vertically align name cells.
3. Add a link to the Ruby Toolbox, which is an invaluable resource.

Please find attached a screenshot of how it looks now and hope it helps.

![screen shot 2014-09-23 at 09 14 56](https://cloud.githubusercontent.com/assets/35007/4369259/0af67a2a-42fa-11e4-939f-045f5eaf57cb.png)