try to implement ruby independent transformer API

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Currently(in Noramark v 0.2 beta 7), Noramark transformer is ruby code.

This means that markup text with custom markup need a transformer written in ruby and should be processed by ruby implementation of Noramark .

If transformer notation is ruby independent (i.e. external DSL), it can be processed easier with Noramark implementation in other programming Language.

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One possible solution : just fix #26 and use XSLT .

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I'm trying to implement transformer in NoraMark syntax.