Issue 730 in robotframework: Add `Grep` that was removed from `BuiltIn` into `DeprecatedBuiltIn`

[robotframework]

Status: Accepted
Owner: ----
Labels: Type-Enhancement Priority-Medium Target-2.5.5
New issue 730 by pekka.klarck: Add `Grep` that was removed from `BuiltIn`  
into `DeprecatedBuiltIn`
http://code.google.com/p/robotframework/issues/detail?id=730

The removal of `Grep` keyword (issue 287) causes some problems. We should  
add it into `DeprecatedBuiltIn`. This special library is automatically  
available.