Issue 626 in robotframework: Document different ways to extend existing test libraries

[robotframework]

Status: Started
Owner: pekka.klarck
Labels: Type-Documentation Target-2.5.2 Priority-Medium
New issue 626 by pekka.klarck: Document different ways to extend existing  
test libraries
http://code.google.com/p/robotframework/issues/detail?id=626

The new `Get Library Instance` keyword (issue 622) provides new way to  
interact with existing test libraries. There are also other ways to extend  
libraries, and we should document them in the User Guide.