Significant and compatibility-breaking changes.

Version 0.4.4:
	- minor cabal and documentation fixes

Version 0.4.2:
	- model.cabal: added upper bounds for dependencies
	- Data.Model.Util: added error handling utilities

Version 0.4.1: Cosmetic changes to documentation

Version 0.4:
	- Data.Model.Types:
		- Modified type of 'constructors' and 'constructorInfo'
		- Removed instances of StringLike (replaced with Convertible)
	        - Modified behaviour of conversion from String to QualName
	- Data.Model.Util:
	        - modified type of 'mutualGroups' and 'transitiveClosure'
		- added some error handling utilities

Version 0.3:
   - Data.Model.Util:
	- Removed 'dependencies', added (similar but not identical) 'transitiveClosure'


