[drupal-docs] Flow chart added to How to upgrade a CivicSpace/Drupal site

[Kieran Lal]

Hi, I listened to Richard's comments and decided that a diagram was in 
order to show the flow of the upgrade of a Drupal site from both the 
database and filesystem perspective and where they are dependent.

For those of you that don't have time to read, you can look at the 
diagram:   
http://civicspacelabs.org/home/files/CivicSpaceUpgrade_lg.png

Cheers,
Kieran