Reading .xlsx fails due to Encoding problems

[JanDornbusch]

Reading xlsx files fails with:

WARNING: Illegal reflective access by org.dom4j.io.SAXContentHandler (file:/.m2/repository/dom4j/dom4j/1.6.1/dom4j-1.6.1.jar) to method com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser$LocatorProxy.getEncoding()
WARNING: Please consider reporting this to the maintainers of org.dom4j.io.SAXContentHandler
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

Beside this warning the repl does not return until interruption.

Opening the file in Excel works after saving it as new file, the output file is growing about 68% without any content changes. (Possible compression within the file?)

I've bumped the dependencies to current versions (poi and poi-ooxml) solving this problem. PR will follow, clojure bumped to 1.7 due to "line" requirement.