omd 0.9.5 (The interface slightly changes!!)

- Omd_representation.Tag of extension becomes Omd_representation.Tag of name * extension (where name = string)
- documentation improvements for Omd_utils
- bug fix for lists that are followed by blank lines which contain spaces
Merge pull request #1613 from pw374/master

omd 0.9.5 (The interface slightly changes!!)