Added IFormatter contract and XmlToHtmlTransformer Class
Added XmlTransformerFixtures
Added implementation for test cases

1.ReturnTransformedHtmlStringForValidXmlInput
2.ThrowExceptionOnInvalidXmlInput
Added getType function to identify document source
Refactored XmltoHtmlTransformer and refined tests.
Merge branch 'master' into XmlTransformer
Removed all conflicts
merged with formatter
Merge pull request #19 from TaviscaSolutions/merge-with-formatter

Merged formatter