added the option to choose casing for loose mode. #207
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this fixes #206.
Instead of the confusing "UpperCase" in loose mode unless "lowercase" is set,
I added the "looseCasing" property to support "upper/lower/unchanged" casing.
looseCasing defaults to "upper" so the default behavior didn't change.
backwards support - setting "lowercase" / "lowercasetags" overrides this property.
tests - added tests for the looseCasing options and also backward support test
readme - updated readme to explain how the new property works