Command description is now set on CommandMenuItems as ToolTip

Main reason why I wanted to change this is because I have 2 MonoDevelop(Main) solutions under Recent solutions(my repo and upstream) both display as Main so I had to guess...
This change has effect on all items in "MenuStrip"... I'm adding SS to display changes notice that before was no tooltips on any of this.
(first 2 images left without change right after change)
![image](https://f.cloud.github.com/assets/774791/2240915/f3da4b8c-9cb4-11e3-81ce-558ae5c7eee7.png)