Create core-it_IT.php

Italian translation WIP
xslt mods for styling, disable network access when loading documents
Create pressbooks-it_IT.po

Italian translation, WIP
Merge pull request #36 from bdolor/importODT

xslt mods for styling, disable network access when loading documents
Merge pull request #37 from liladude/patch-1

Italian translation.
re-instating workaround for PHP XML custom entity shortcomings
Merge pull request #38 from bdolor/importODT

re-instating workaround for PHP, XML custom entity shortcomings
Fix: Try to parse non-well formed documents
Add Italian translation to our interface.
Fix: Custom user meta was missing.
Merge remote-tracking branch 'upstream/dev' into dev