Spanish localization
Merge pull request #470

Commits were squashed and rebased. Closes #470.
Update Readme with spanish translation
replaced javatuples lib with small utility class

The javatuples library is not OSGi-enabled, which as a consequence makes epubcheck unusable in a OSGi-context.
Merge pull request #471 from josteinaj/remove-dependency-on-javatuples

replaced javatuples lib with small utility class
French localization

This is the french version of the file MessageBundle.properties.
Merge pull request #472 from vincent-gros/master

French localization
Update Readme with french translation
Update Readme with further translation instructions
typos in japanese jing translation
Allow to output to stdout with the - argument.

Fixes issue 351.
Modify the XmpReportImpl and XmlReportImpl to work on PrintWriter only.