Improved message for non configured ebook converter

Gdrive cleared interface (drive variable)
refactored web -> reverseproxy outsourced, edit_books split, removed unused md5 function
rearanged imports
added Wand and pytz Version info to stats Page

cps/converter.py

@@ -45,5 +45,5 @@ def versioncheck():
     elif ub.config.config_ebookconverter == 2:
         return versionCalibre()
     else:
-        return {'ebook_converter':''}
+        return {'ebook_converter':_(u'not configured')}