Finish partial XPath implementation.All unit tests for it pass now.
Avoid stack overflow.
Better error message when a class cannot be loaded.
Add incomplete, even for WebODF, XPath implementation.This is needed since IE has no support for XPath.
Clean up RawDeflate.js
Fixes for IE9.
Refactor all use of XPath to a separate class.
Fix crash when there is no fontface declaration.
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