Added IVersionMetaDataEx(tended) closes  #295
Choose the least breaking way of implementing this feature
Renamed IVersionTableMetaDataEx to IVersionTableMetaDataExtended, just to reveal intend better
Merge branch 'Issue295' of https://github.com/tommarien/fluentmigrator into tommarien-Issue295

Conflicts:
	src/FluentMigrator.Runner/VersionLoader.cs
	src/FluentMigrator.Tests/Unit/TestVersionTableMetaData.cs
	src/FluentMigrator/VersionTableInfo/DefaultVersionTableMetaData.cs
Merge pull Request #427 of tommarien/Issue295

* tommarien-Issue295:
  Renamed IVersionTableMetaDataEx to IVersionTableMetaDataExtended, just to reveal intend better
  Added IVersionMetaDataEx(tended) closes  #295 Choose the least breaking way of implementing this feature